Biophilic Architecture for restoration and therapy within the built environment

Can ‘restoration and therapy in design’ signify something more than the places like hospitals and healing gardens? Can those restorative environments be brought inside the working and living environments to mitigate the psychological problem at the source? The main objective of this paper is to look at the strategies and developments of Biophilic design with respect to therapy and restoration in order to achieve sustainability in terms of quality of life within the immediate built environment. The paper explores the mental health issues under the domains of built environment and indoor environment with respect to their connection with nature. Biophilic design has gained a favourable momentum within the last four decades and is now visualised as a medium that bridges the gap between humans and the nature. Out of a variety of measures of sustainable environmental design, biophilic design focuses on the end-results of naturally nurtured or inspired habitats and workplaces. It embodies strategies of Green and Intelligent buildings, works as a mitigation strategy for foul indoor environment and establishes the vision that veristic sustainability can only be achieved if there is qualitative control over human physiological prosperity and psychological health. In the context of work efficiency, preference and productivity within the indoor environment, it is seen as a promoter of constructive thoughts and enhancer of creativity. The paper aims to enlist biophilic design and retrofitting strategies, which can improve cognitive function, reduce stress and provide mental peace within the built environment.


Introduction Methodology
The literature including biophilic patterns of design, behaviours and environment were identified by web searches, research papers' reference list and from articles of prominent, peer reviewed and scientifically indexed journals of environment, psychology, health and architecture.

Literature Search
Psychology, health, environment and architecture databases of SCOPUS, Web of Science, ProQuest and Google Scholar were searched between June -August 2020 using words and synonyms of 1) Biophilia, 2) Sustainable architecture, 3) Built environment, 4) Well-being, 5) Restorative environment. The quantity of available literature was limited to article titles and abstracts for appropriateness of database searches. Approximately 6430 results were enlisted for further extension of the research.

Article Selection
Articles and literature were screened in two stages: The first stage includes examination of titles and abstracts if they mentioned biophilia and whether they were published in peer-reviewed and scientific indexed journals in order to regulate the quality of research. 314 relevant articles, books and documentations were shortlisted based upon the above criteria. The second stage screening included a strict analysis of full text if: 1) The text mentioned E.O. Wilson's Biophilia hypothesis in relation to design adaptations 2) The text had systematic analysis of behaviour and psychology around biophilic built environments.

Biophilia and Biophilic Design
The term 'Biophilia' was first mentioned in the works of German psychologist Fromm (1973), as "the passionate love of life and of all that is alive". The term has ancient Greek origins (bios: life, philia: love) and was later popularized by American biologist Wilson (1984). In the hypothesis, biophilia is defined as "the urge to affiliate with other forms of life" (Kellert and Wilson, 1993). Human evolution has demonstrated that 99% living species had an adaptive response towards natural environment and its subsequent forces (Kellert and Calabrese, 2015).
These adaptive responses led to prolonged human reliance on nature and its resources. Biophilic design is the multidisciplinary transformation of biophilia into the design prospects of built environment (Kellert et al., 2011) Reference Definition Fromm (1973) The passionate love of life and of all that is alive. Wilson (1984) Our innate tendency to focus upon life and life-like forms and, in some instances, to affiliate with them emotionally.
Kahn (1997) A fundamental, genetically based, human need and propensity to affiliate with life and lifelike processes The evolution of Humans as a species from Homo sapiens' migration out of Africa until the invention of electricity has been seen as a bio-centric development of physique, mind and senses (Kellert and Calabrese, 2015;Kellert, 2018). Architect and design theorist Christopher Alexander (1977) has expressed in his book 'The Pattern Language' that a number of natural patterns here are quintessential for humans, they are deeply inbuilt within the human nature now and they are going to be there within them for the next 500 years as well. Sturgeon (2017) in her book on 'Creating Biophilic Buildings' mentions that we have used our buildings since the industrial revolution to claim superiority over nature and to illustrate our alienation from it. The consequences of global climate change have forced us to turn to urgent solutions, and now our buildings and their 40% share of energy usage are key influencers in this regard. According to a study conducted in Sweden by psychologists Ohman and Mineka (2001), humans as a species have hereditary behavioural inclination towards natural forces, while their stimuli responses swing between constructive and destructive in terms of emotions. The available research in this domain considers four aspects of the natural world ( Fig.1): animals, plants, landscapes, and wilderness (Frumkin, 2001). The concept of Biophilia strengthens the premise that the built environments need to be equipped with both biotic and abiotic features for psychological wellbeing as well as for preservation of natural environment (Downtown et al., 2017).
Biophilic design is based on the conceptualization of the theory of biophilia within the perspectives of architecture, urban design, landscape design and sustainability. Kellert (2018) recently affirmed, "Buildings and living spaces with biophilic design bring people closer to nature". Biophilic Design depends upon the following basic elements (Fig. 2): natural ventilation, natural lighting and organic forms (which exist naturally), and natural landscapes. These features strengthen the bond between humans and their immediate environment (Duzenli et al., 2017). Research conducted in this field shows that upcoming residences, schools, townships, hospitals and corporate offices have embarked on a process of acknowledging the beneficiary aspects of Biophilic design. This particular aspect of Biophilia and Biophilic Design has led to development of curated and humancentric building design rating systems and guidelines which are voluntary in nature like International Living Future Institute (ILFI)'s 'Living Building Challenge (LBC, 2012)' and 'Biophilic Design Guidebook' respectively. The Health + Happiness Petal's mission of ILFI is to build safe environments that allow all organisms to flourish by linking people to nature and ensuring that healthy air and natural daylight are in our indoor spaces. The Living Building Challenge aims to create a developed setting that is nourishing, highly efficient and safe where everybody has fresh air, sunshine, scenic views outside and can be related to the weather, seasons and time of day.

Wellbeing, Stress and Restoration
Humans spend an average of 90% of their total time in the vicinity of built environment. Mental health is affected by built environment in two ways (Fig. 3), direct and indirect. Housing situations, crowded spaces, noise, indoor air quality, and ambient light are among the features of environments which have direct mental health consequences. Mental health is indirectly affected by interferences in psychosocial processes by built environments (Evans, 2003). Psychosocial processes are related to human psychological aspects such as wellbeing, commitment, engagement, self-efficacy, self-esteem, belongingness, motivation and satisfaction. Altering the psychosocial processes often leads to mental disorders of varying degrees in which built environment may or may not be the cause of disorder and is rather seen as an enhancer (Carlson et al., 2012). Mental illness is considered a major psychological issue for the prisons of 21st century, and a variety of research has concluded that around 89% of prisoners face traits of depressive persona and 74% have experienced stress related issues (Söderlund and Newman, 2017).
Lowering the rate of performance and productivity.
Lowering the rate of performance and productivity.

Disturbed circadian rhythm.
Lowering the rate of performance and productivity.

Distraction
Behavioral and physiological effects.

Decision-making.
Lowering the rate of performance and productivity.
Tiredness. According to a study conducted on 'Built environment and mental health', attractive internal environments which are based on the use of plants lead to lower perception of stress and helps in creating a restorative environment (Renalds et al., 2010). Multiple studies have proposed that confrontation with nature reduces the chances of heart related diseases and abnormal pulse rates, maintains a healthy blood pressure, diminishes the production of cortisol and enhances parasympathetic nervous system functions, which directly relates to internal organs and glands (Song et al., 2016).
Humans react positively not only towards direct exposure to natural environment, but they have also responded with certainty to artificial imitation of nature and its forms in fractal patterns, and also to cases of organic and conceptual mimicry of natural entities (Appleton, 1996). For example, Kulper and Roy (2005) attempted to link architecture with biophilia through the design of an 'Institute for Nano Biomedical Technology and Membrane Biology' in China. They imitated the design of a cell for the exterior of the building and the interior mimics molecular biology (El-Zeiny, 2012). Another example of this are the Treepods installed for Shift Boston's 'Urban Intervention Contest'. The Treepods mimic the concept of trees and utilize it as an air cleaning system that traps CO2. Since it is based on the design of Dragon tree, it has wider foliage and is preferred by locals for shade (Rao, 2014). Rai et al. (2019) and Rai et al. (2020) in two separate studies investigated the role of Biophilic Environment Variables (BEVs) in terms of Perceived Restorativeness Quality for a religious and historic environment of churches. They concluded that although both the churches under study were designed in the same architectural style and within the same era, they slightly vary in their perceived restorativeness quality due to richness of BEVs and site context of their built environment.
In his study on effects of natural elements such as sound and sight on the people with Flexible Bronchoscopya, Diette (2003) concluded that use of murals inspired by nature and natural sounds help in minimizing the degree of pain they experience. A study conducted by Lohr and Pearson Mims (2006) reinforced the hypothesis that the presence of indoor plants in an uncomfortable or stressful environment raises the pain tolerance of the occupants. Lohr and Pearson had previously conducted a similar study for a window-less work environment and found that occupants exhibited less stress, had more productive thoughts, and had more presence of mind when natural plants were used in the room interior in comparison to the data collected for the same room without the indoor plants (Lohr et al., 1996).
A further analysis of the selected available literature was conducted and the data was categorised accordingly based on impact on the associated and relevant patterns of biophilic design. Certain benefits of biophilic design have been listed in Table 3. along with the applied strategies used to attain them. The degree of benefits includes mood enhancement, sense of defence against outdoor environment, satisfactions of thermo receptors of the body, cognitive improvement, stress management, constructive problem-solving skills, improvement of short-term memory and enhanced creativity.

Authors
Strategy Benefits Herzog (1985) Use of paintings and photographs of Rivers, ponds, lakes, mountain waterscapes and large bodies of water.
Positive impact on mood. Ruddell and Hammitt (1987) Shaded and semi-covered spaces for outdoor environment to create refuge.
Provides sense of defence and surveillance against outdoor environment. Orians and Heerwagen (1992) Use of clean water, which has reflection possibility.
Evaporative cooling: satisfies the thermoreceptors of body. Appleton (1996) Artificial imitation of nature and fractal patterns. Organic and conceptual mimicry of natural entities.
Positive psychological response towards immediate environment. Lohr et al. (1996) Lohr andPearson Mims (2006) Use of plants in windowless indoor environment. Pain tolerance and stress management. Increased productivity and enhanced presence of mind. Rapee (1997) Introducing levels of risk and control in design. Enhances problem solving and decision making skills.
Edwards and Torcellini (2002) Modified daylight mechanism, which can adjust throughout the day.
Artificially generated mood and creativity enhancer for workplaces and habitats.
Van den berg et al.
Natural movement of water.
Stress reduction.
Diette (2003) Use of natural sounds and murals inspired by nature.
Reduction in degree of pain experienced by patients of flexible bronchoscopya.
Ikemi (2005) Creation of mystery through arrangement of tress and objects.
Enhanced preference of space or facade in case of housing.
Leslie (2008) Friedman (2017) Design of open and unrestricted spaces to represent prospect.
Provides sense of security to the occupants. Enhanced creativity.
Visual connection with nature for 5 -20 minutes. Stress reduction.

Van Wieren and
Kellert (2013) Elements with unprecedented organic growth like planters and shrubs.
Acts as natural modulators of fear and surprise for the pedestrian.
Benfield et al.
Natural sounds Recovery from stress, wounds and sickness.
Browning et al.
Good connection with ongoing natural processes and systems.

Biomorphic designs and patterns
Relaxation, nostalgia, enlightenment and repeated anticipation. Minimises stress and creates visually preferred environments.
Generates interest and acts as natural energiser. Song et al. (2016) Confronting natural environments. Reduces chance of heart diseases, balances pulse rate and blood pressure, reduces secretion of cortisol and enhances parasympathetic nervous system.

Sharifi and Sabernejad (2016)
Appropriate task specific lux levels of light.
Improves the accuracy of senses and induces the power of vision. Lee and Park (2018) Including accessible hideout spaces in library design, which can provide a view of natural systems.
Psychological stability: tranquillity and safety in an unfamiliar environment.

Yin et al. (2018)
Short exposure to biophilic indoor environment. Lower systolic and diastolic blood pressure and skin conductance. 14 % improvement in short term memory. Biophilic design has constructive impacts on the human psychology, physiology and immediate surrounding environment. The benefits enlisted in Table 3 strengthen the postulates of Wilson's Biophilia hypothesis. The studies conducted by Ryan et al. (2014) and Cramer & Browning (2008) have strengthened the premise of biophilic design and argued that biophilia in design helps in improving the overall health of the occupants and works positively for their levels of satisfaction, quality of performance and productivity.

Patterns of Biophilic Design
There have been a number of significant attempts to categorize and relate various variables and attributes of biophilic design to have a confined idea of an actual hypothesis for biophilia in architecture and in its associated disciplines. The most acknowledged versions of this are by Kellert and Wilson (1995), Soderlund and Newman (2017), Browning (2014) and Bolten and Barbiero (2020) and which discuss the major classification of biophilic patterns. A detailed 62 variable classifications were developed by Asim and Shree (2019) where they evaluated a biophilic environment of a student hostel in an academic campus in lower Himalayas.   (2014), in a nascent effort to gather evidence for different aspects of biophilic design, proposed '14 patterns' and justified the use of term 'pattern' for three reasons: 1. To propose a clear and standardized terminology for biophilic design.
2. To avoid confusion with multiple terms already in use like metric, attribute, condition, characteristic, typology, etc.
3. To maximize accessibility for designers and planners by upholding familiar terminology.

Visual connection with nature
Visual connection with nature is observed as an important aspect of biophilia as it deals with several elements of visual comfort and relaxation. An example of this can be found at Myst (Fig. 5), which is initially designed as a biophilic housing project in hilly region of Kasauli, India. Each residential unit has unobstructed views of nature in order to regulate and maximise the functioning of occupants and to enhance their creativity. It is also one of the most evident examples when it comes to identifying emerging design parameters: • Stress reduction through visual connections with natural elements Van den berg et al., 2003). It also alleviates mood and enhances self-esteem (Biederman and Vessel, 2006;Fuller et al., 2007).
• Give priority to real natural elements instead of artificially produced or acquired aspects of nature (Kahn et al., 2008).
• Prioritizing the promotion of biodiversity over expansion of land (Fuller et al., 2007).
• Giving priority to spaces for exercise and recreation, which have visual connection with green spaces (Barton and Pretty, 2010).

Non-visual connection with nature
Non-visual connection with nature can be distinguished in the form of sensory receivers other than visual (eyes), such as auditory (sense of hearing), haptic (touch or kinaesthetic communication), olfactory (sense of smell), or gustatory (taste) that create a positive response to natural elements. F.L. Wright's organic architecture marvel 'The Fallingwater' (Fig. 6) depicts non-visual connection with nature where the sound created by the movement of water acts as a comforting and restorative element for the occupants.
From the activity and responses of above-mentioned sensory receivers, we can identify emerging design parameters as: • Small or momentary interventions with non-visual sensory stimuli can have a positive health impact (Alvarsson et al., 2010).
• Giving priority to natural sounds over unpleasant urban sounds to generate physiological and psychological relief (Alvarsson et al., 2010).
• Utilizing the natural sounds of birds, winds and rustling of leaves to enhance the creativity of the people (Mehta et al., 2012).

Non-rhythmic sensory stimuli
According to Ryan, non-rhythmic sensory stimuli are random and transient connections with nature that can reduce stress and improve productivity. The non-rhythmic sensory stimuli can be listed as clouds, shadows, nature sounds, and water reflections. A space that has good non-rhythmic sensory stimuli acts as a refreshing environment, centralizes human interest and functions as a natural energizer (Ryan, 2015). Fig. 7 depicts the implementation of elements of non-rhythmic sensory stimuli in active designs of Shimla Wildflower Hall and The Oberoi Amarvillas, Agra.
Emerging design parameters for non-rhythmic sensory stimuli can be identified as follows: • A cast shadow can be utilised to reveal features of the 3-dimensional form that are not usually apparent in a direct view of the object hence emphasising the space (Tregenza & Loe, 2013).
• The clouds can be treated as restorative mediums due to their non-rhythmic nature and can be utilised through horizontal or diagonal openings in the roof or wall to make creative use of their view from interior spaces (DeKay & Brown, 2013).

Thermal and Airflow variability
The role of ventilation and thermal comfort is very crucial in the satisfaction index of human habitats. Airflow, thermal diversity and natural ventilation are some key factors that provide thermal comfort to the occupants of buildings. Fig. 8 features the thermal comfort zones within the bioclimatic charts as put forward by Olgay et al. (1963) and Givoni (1992). Olgay's chart uses 21º C (dry bulb temperature) as the threshold for sunlight, moisture and winds required in order to obtain thermal comfort, whereas Givoni's version of bioclimatic chart advocated for a thermal comfort range of 20ºC -28.5ºC along with a 10%-90% range for relative humidity. According to ASHRAE (2013), for human thermal comfort the average humidity should range between 30% to 65% and the average temperature should range between 22.8º C to 26.1º C in summer and 20º C to 23.6º C in winter. Figure 6. Thermal comfort zones a) Bioclimatic chart (Olgyay et al, 1963). b) Building bioclimatic chart (Givoni, 1992).
The current population growth has put a significant pressure on the resources of renewable energies as well as on the ones provided by fossil fuels. To minimize the impacts of this on the energy, adequate ventilation and regulation of heat sources is recommended for buildings (Sharifi and Sabernejad, 2016).
Emerging design parameters for a balanced thermal environment and airflow are as follows: • Maintaining low and dense vegetation between the buildings especially where high temperatures are measured (Gaitani, Mihalakakou & Santamouris, 2007).
• Maintaining a small water body to induce evaporative cooling for the surroundings (Givoni, 1992).
• Pergolas used with deciduous plants and trees provide solar control and provide a shade induced cooling in summers (Sandifer, 2009;Alexandri & Jones, 2006).
• Employing green roofs and green walls for reduction in heat gain and for maintaining a fresh air flow (Alexandri & Jones, 2006).

Presence of water
The presence of water in biophilic architecture is considered a restorative environment both in visual as well as auditory aspects (Ulrich et al., 1991;Alvarsson et al., 2010). The quality of water decides the degree of human preference towards it for restorative environments, i.e., dirty water will be less restorative than clean water (White et al., 2010). Other than its psychological benefits, water has climate responsive capabilities as it helps in bringing down rising temperatures through evaporative cooling and induces comfort through satisfying the thermoreceptors. St. Fiachra's garden in Ireland (Fig.9), designed by landscape architect Martin Hallinan, carries restorative and recreational properties as it depicts water in its positive aspects. Emerging parameters for water in biophilic design are as follows: • The perception of water should be as a clean element (Orians and Heerwagen, 1992).
• Priority should be given to an experience that involves use of multiple senses for water (Alvarsson et al., 2010).
• Priority should be given to natural movements of water which are unpredictable (Van den Berg et al., 2003).

Dynamic and Diffuse Light
Light is associated with human psychology for visual comfort and has different results for a variety of exposures to it. Research suggests that the presence of natural and transparent light induces a positive psychological effect on the senses of occupant and if the source of light is sun then it enhances a vital locomotion movement, further promoteing flow of positive emotions and enhancing creativity (Almusaed, 2010). Appropriate lighting of a space promotes the accuracy of senses and induces the power of the vision (Sharifi and Sabernejad, 2016).
Emerging design parameters for balanced dynamic and diffused lighting are as follows: • Transitional balance between indoor and outdoor spaces in terms of separation, privacy and zoning can just be induced through dynamic lighting conditions without the presence of any physical medium to act as a separator (Kelly, 1952).
• A modified daylight lighting mechanism, which has the capability to change throughout the day to mimic the features of natural light, such as circadian rhythm-based lighting system, can pave a way for artificially generated mood and creativity enhancer systems for workplaces and habitats (Brawley, 2009).
• Indirect exposure to ambient light through perforations can be ensured, which enhances the preference of the space and makes the space appear larger. It also improves the brain's cognitive function and gives positive psychological feedback (Ozdemir, 2010).

Connection with Natural Systems
In their book '14 Patterns of Biophilic Design', Browning, Ryan and Clancy have described connection with natural systems as "the awareness of natural processes, especially seasonal and temporal changes characteristics of a healthy ecosystem". Any space with a good connection with natural systems creates a bond to a greater whole that in turn improves the experience to provide relaxation, nostalgia, enlightenment and repeated anticipation .

Figure 9. Viceregal Lodge (Rashtrapati Niwas) in Shimla designed by Architect Henry Irwin. a) West Elevation (left) b) East Elevation (right) (Source: IIAS Archives)
The Viceregal Lodge was built in Jacobethan style by the architect Henry Irwin in 1888 as a summer retreat for the then Governor of British India -Lord Dufferin in Shimla. The entire complex was designed in accordance with the natural systems of the hilly region. In order to utilise the heavy rainfall that the region receives, underground reservoirs were built below the landscaped gardens to accommodate rainwater for all the activities of the compound. Post-independence, the volume of water and capacity of tanks were extended to supply water to the neighbouring localities of Tilak Nagar, Ghora Chowk and Hanuman Temple. New overhead tanks below the elevation line of the main building were constructed. According to Detailed Project Report (2009), the complex, with all the overhead tanks and underground reservoirs, has a capacity of 0.23ML (Singh and Kandari, 2012). The way the Lodge (Fig. 11 & Fig. 12) was set up against the slope of the hill gave it the ability to channelize and store water on lower levels and to interact with a variety of natural systems occurring around it. Emerging design parameters to create quality connections with natural systems include: • Collection, treatment and use of rainwater into the design of landscapes that is responsive to monsoon and channelizes surface run-off of water (Kinkade-Levario, 2007).
• The provision of visual access to naturally occurring systems is considered the easiest and smartest cost-effective approach. In other cases, the inclusion of design that has responsive tactics, robust structures, and adaptable land formations helps in achieving the desired levels of mobility for the design (Lin, de Dear & Hwang, 2011).

Biomorphic forms and patterns
"Biomorphic forms and patterns are symbolic references to contoured, patterned, textured or numerical arrangements that persists in nature" . Biomorphic forms have been evident in a variety of artistic expressions, designs and structures throughout the evolution of civilization. Their presence can be seen in the ancient temples of Egypt, India and Rome and even in most modern designs of the Spanish architect Santiago Calatrava (Hu et al., 2013). There has been an exponential reliance of architecture and design on biomorphic forms due to its mathematical relevance in the construction of various forms of buildings and the utilization of sanctum spaces as seen in temples of India, Greek and Rome through mimicking natural elements with respect to the human body (Feuerstein, 2002).
In his paper on 'Applications of the Golden Mean to Architecture' Salingaros (2012) affirms: "A crucial lesson that comes from understanding natural structure is to realize that scales in a natural hierarchy are skewed towards the smallest sizes. Natural growth begins at the infinitesimal scale and develops through an ordered hierarchy up to the largest size". Biomorphic patterns help in creation of more visually preferred environments that are capable of enhancing cognitive performance of occupants through assistance in minimizing the stress .
Emerging design parameters to create qualitative biomorphic condition are as follows: • The biomorphic attributes should be applied on 2 or 3 planes or dimensions (e.g., floor plane and wall; furniture windows and soffits) for greater diversity and frequency of exposure (Salingaros, 2012).
• As a design measure, try to avoid the overuse of forms and patterns that may lead to visual toxicity (Michl, 1995).
• More interventions that are comprehensive will be cost effective if they are introduced early in the design process .

Material connection with Nature
'Material Connection with Nature' pattern involves various physiological responses to a variety of elements of natural materials, and the influence of a nature-based colour spectrum, of which the green colour exhibits features of improved cognitive conduct. Building materials that are derived from original natural materials are analogous to their 'natural' state . The architect Cesar Pelli recalled that as a student of architecture he learned that verite modern architecture should depict no colour other than the colours of natural materials (Caivano, 2006). Architects and designers who belong to the purist regime of the profession consider whites, greys or anything else as superficial or unprincipled if they are not natural (Pelli, 1996).
USGBC's LEED gives extra weightage to the buildings, which efficiently adopt the sustainable and green materials with minimum or negligible impact on the environment. The materials affect the cognitive user performance as well as reducing the energy consumption in some cases (Meisel, 2010). Pacheco-Torgal and Jalali (2011), in their research on use of vegetable fibres in cementing materials, concluded that long bamboo fibres provide extended durability when used with cementing liquid. Apart from ecological and economic benefits, since bamboo is capable of representing the plant kingdom for a very much longer duration of time due to its colour, it is preferred by designers to imitate a natural environment.  Emerging design parameters for creating a qualitative material connection with nature are as follows: • The frequency of use of a material in a space should be based upon its function (Addington & Schodek, 2012) • There should be a preference for natural materials over synthetically fabricated materials as human sensory receptors can identify and sense the difference between them (Ritter, 2007).
• The use of colours in a space should be done on an experimental basis. However, the green colour is favoured by designers due to its ability to enhance the mood of creativity in spaces (O'Connor, 2011;Minah, 2012;Dalke et al., 2006).

Complexity and Order
A space that exhibits information in the form of complexity is considered engaging for human mind. It creates intrigue and is often considered as a regulator of balance between visually generated feelings of boredom and profusion. The main objective of this pattern is to create a visually productive environment that provokes a constructive cognitive response. Salingaros (2012) claimed that design bears a connection with natural growth through a structured hierarchy at various levels that can be found in a variety of natural structures. This structured establishment can however be complex and may appear to be ambiguous to users. This sense of complex nature relates to another biophilic pattern, i.e., mystery.
In his paper on 'Chaos and geometric order in architecture and design', Rubinowicz (2000) explained that these two elements are the basic components that constitute the structures of urban and architectural significance. They co-exist naturally and are interdependent. Geometric order is created through meticulous design and organised planning whereas chaos is generated when processes are self-organised. The architect Daniel Libeskind is known for creating a balance between geometrical order and chaos in his buildings while justifying intriguing feelings and emotions.  Fractal geometric patterns are a discrete result of repetition and a case of definite origins around which the entire evolution of form takes place (Kellert et al., 2011;Hagerhall et al., 2008). Understanding an already existing design is difficult and challenging but creating a complex fractal pattern from origin is easy and repetitive in nature.
Emerging design parameters that can help in evolving a qualitative Complexity and Order based pattern are as follows: • To give priority to fractal geometries while dealing with aspects of urban planning, architecture façades, landscape design, etc. .
• To have greater impact of form in design, the fractal patterns with 3 iterations must be preferred over fractal patterns with 2 iterations (Kellert et al., 2011;Browning et al., 2014).
• The overuse of fractal patterns should be avoided to maintain a balance between stress reduction and restoration. The underuse of fractal patterns may lead to disinterest in design and offer predictability (Kellert and Calabrese, 2015;Browning et al., 2014).
• Buildings with fractal patterns as design elements in façades must consider the context and the impact on the city skyline Joye, 2007).

Prospect
Prospect is defined as a pattern which provides an undisturbed, unrestricted, open and clear view over a large area or space for the purpose of monitoring, planning and surveillance. The idea of this is to provide the occupant with a sense of freedom as well as an inherent sense of safety, security and control over their immediate environment that is not native to them . In his book 'The Wright space: pattern and meaning in Frank Lloyd Wright's houses', Hildebrand (1991) explained that for spaces in building interiors or for spaces of high urban density, prospect is considered as the ability to observe one space through another. It builds up when there is certain divergence with the option to see through an alignment of multiple spaces. One of the best examples of prospect is Kahn's Salk Institute in California. Its central courtyard establishes the idea of prospect within the premise of built environment through the deliverance of open and unrestricted spaces in it, while it strengthens the sense of security for the occupant (Friedman, 2017;Leslie, 2008). Emerging design parameters that may help in creating a qualitative Prospect are as follows: • Design interventions like placing stairwells at building edges with glass façade and internal glass walls can form a stable Prospect feature.
• Fenestrations that allow visual transparency along the corridors can make feature rich arrangements opportunities for workstations in office spaces (Ozdemir, 2010).
• A focal length range between 6 meters and 30 meters is preferred when there is adequate depth available for enhancing the experience of the user for walking, bicycling and similar exploratory in campus activities. This gives the user a control over their subconscious range of vision and enhances the preference of the space .
• Preference should be given to the quality of the symbiosis of Prospect and Refuge rather than the size or the repetition of the same feature (Joye, 2007).
• Visual Connection with Nature has the capability to optimize the Prospect experience with a quality view (Beatley, 2011).

Refuge
According to Browning, Ryan and Clancy (2014), "Refuge is a place for withdrawal, from environmental conditions or the main flow of activity, in which the individual is protected from behind and overhead". A space which offers a good Refuge pattern should enhance the feelings of safety, offer a sense of 'katabasis' i.e., retreat or recoil, for stress relief, restoration and inducement of a work efficient environment for individuals or groups. Dosen and Ostwald (2013) explained that the theory of prospect and refuge is about being able to observe all your surroundings while being hidden and secure. This trait of human psychology is the reason why certain environments are preferable while in isolation like lighthouses, lake-houses and ranches.
A qualitative Refuge space has the ability to appear unique and stand out from its native environment. It offers a meditative, protective and welcoming environment without creating any unnecessary disengagement for the occupant (Appleton, 1996). Hildebrand (1991) argues "the edge of a wood is one of the most prevalent of natural prospect-refuge conjunctions" because it offers defence against hostile forces like weather and predators, while enableing the occupant to have extended outward surveillance.
According to Grahn and Stigsdotter (2010), the feedback for health in the case of refuge is better than that of prospect. In addition, the symposium of both the patterns (prospect and refuge) delivers an elevated and enhanced result and establishes hope for further collaboration between these two for improvement of biophilic design. Villa Kogelhof (Fig. 18) is an example of both prospect and refuge as the building sits in a desert landscape with open and unobstructed views on all ends. It is built in two sections: one is built underground giving the assurance of refuge in the isolated environment and the other is uplifted with minimalistic and obscuring supports separating it from the ground and whatever remains normal.
A study aimed at identifying the components of restoration in small urban parks concluded that the restoration capabilities of a park does not depend only on the size rather it includes the design and its components as well (Nordh, 2009). For large urban parks, users prefer refuge areas under large trees that offer shade and spaces around the vegetation surrounding a meadow (Ruddell and Hammitt, 1987).
Emerging design parameters to attain qualitative Refuge are as follows: • Lower ceiling levels induce an effect of refuge within usual environments. Some architectural adaptations for refuge inside the built space are soffit, false-ceiling and suspended fabric Dee, 2004).
• A combination of refuge spaces should be used instead of a single one for buildings where a higher frequency of users is involved (Day, 2017).
• The refuge spaces and their adjacent spaces should use different lighting systems and there should be a separation based on the functionality of the space (Dawes & Ostwald, 2014).

Mystery
Mystery is a spatial state indicated by the assurance of more information made evident by the existence of relatively concealed views or other sensory impetus that intrigues and stimulates the individual to explore further into the native surroundings (Herzog and Bryce, 2007;Ikemi, 2005;Kaplan et al., 1989). The basic understanding of this pattern comes from psychologists R. Kaplan and S. Kaplan's (1989) claim that people need only 2 basic things from an environment: 'to understand' and 'to explore'. Mystery is a useful pattern that can be utilized to modify spaces in indoor and outdoor including walkways, entrances, plazas and buffer spaces.
Robie House, designed by Organic Architecture pioneer Frank Lloyd Wright in prairie style, has several aspects of mystery and biophilia as it hides the information from the visitor and there is a sense of control with the occupant. The long overhangs of shading devices and indirect entrance are two distinct ways to enhance the characteristics of mystery in a building. Emerging design parameters to attain quality in Mystery pattern are as follows: • Use of curved edges is recommended as they play a more significant role in comparison to pointed edges, while guiding people's movement along them .
• Speed of movement of people through the space is a considerable factor for mystery as it enhances the small or large nature of the space in fractions of time. Design should control speed of movement through offering distractions and mild obstructions in the pathway (Fayazi, 2014).
• Dramatic use of shade and shadow can add to the mystery of the space (Stewart-Pollack and ASID, 2006).
• Elements with unprecedented organic growth like planters and shrub rails serve as the natural modulators of fear and surprise for the pedestrian (Van Wieren and Kellert, 2013).

Risk/Peril
Risk or Peril can be stipulated as a combination of threat and associated safety . Environment has a way of revealing itself through creation of certain border parameters such as a limit line. This occurs in an environment that is capable of running multiple activities altogether (Fisher and Pedersen, 1996). For example, the first glance creates fear or a feeling of risk while looking at a façade, which does not have a supporting wall, or a guiding handrail. However, the design makes people feel safe and forget this fear when they walk along the same space (Movahed, 2015).
Risk can be a result of a response situation triggered through the reflexes as a learned mitigation and defence mechanism against an alleged danger. When the same risk is ruled out as a reason of causing harm, it ensures safety and becomes a trust element. The levels of danger and the level of control addresses whether it is risk or actual fear (Rapee, 1997). Risk / Peril has the task of intriguing people with curiosity, gaining attention and refreshing the memory so as to enhance their problemsolving skills.
Emerging design parameters that can be used to attain quality in Risk / Peril pattern are as follows: • Risk/Peril should be approached with precision, as it is a sensitive element for human psychology.
Its user base must be well defined and precisely targeted (Honga et al., 2017).
• The element of safeguarding the user must not create an overwhelming environment, which kills the possibility of risk. Risk should be kept as the end limit for the user, certain yet undefined (Zari, 2017). One of the best examples of risk/peril can be seen in the glass skywalks where the users face acrophobia through walking on a safeguarding walkway experiencing groundlessness (Deriu, 2017). In that case, their safety is certain, yet they are subjected to a sense of taking risk. Skywalks are built as safe and highly controlled environments; they are expected to provoke the user's acrophobia by subjecting them to the view below their feet. The structure built out of multi-layered tempered glass ensures a sense of safety. This experience surpasses the visual senses to such an extent that it may call upon the brain to create a sensation of dizziness (Yardley and Redfern, 2001). Furthermore, sensory situation activates the sixth sense of the body traditionally called 'kinaesthesia' i.e., muscle sense (Stillman, 2002).

Conclusion
Biophilia has been a part of human habitats for some twelve millennia and has really only experienced a setback during the rise of the machine-oriented world in the last 250 years. Biophilic architecture acts as a symposium of technology, applied sciences and architecture by aptly following nature and its processes. The Biophilia hypothesis by Kellert, as well as the 14 patterns by Browning, Clancy and Ryan, have laid down the groundwork for the further development and research in this field. Biophilic design has arguably been an important influence in favour of sustainability and human well-being. The available research literature amply bears witness to its importance and emphasizes the idea that biophilia is both a part of human life and also a sustainable and healthy approach for its future. The future belongs to cities and when dealing with those highly densified built environments the scope for nature has to be discussed in the context of human health and well-being.
At the frontiers of architecture, biophilia should not be seen as merely a kind of luxury aesthetic adaptation in design. It has existed throughout the history of humanity and must be given relevant space in architecture so that there can be a positive impact on the mental health of the population and its immediate surroundings in the most suitable way possible. A multidisciplinary approach has to be adopted in order to conduct further research within the directives of biophilic design on a case-tocase basis to find out the preference, productivity and efficiency in terms of certain sets of criteria. It can include the relative weightage of each of the 14 patterns of biophilic design or the development of a more comprehensive and analytic tool like the Biophilic Quality Index (BQI) proposed by the Malaysian architect K. Yeang. Detailed research with respect to the different aspects like economics, use of energy and health in biophilic design must be undertaken in accordance with issues like absenteeism and presenteeism for work environments. If humans do not evolve to a point where they can live without nature, then biophilia has a long journey on which to thrive. There is an optimistic possibility that with the guidelines of LEED and environmental sustainability directives, a great deal more can be targeted for expanding the scope of sustainability through biophilic design.

Glossary Restoration
'Restoration' is improvement of cerebral functions and mental stress through exposure to nature .

Restorative Environment
Restorative environment is positive nature-rich environment such as scenic views, natural water bodies, flora and fauna that enhances the restoration of humans .

Built Environment
Man-made surroundings that provide the setting for human activity, ranging from the large-scale civic surroundings to the personal places" (Hollnagel, 2014).
Veristic Sustainability Veristic Sustainability refers to the notion of achieving sustainability through naturalistic means (authors).

Therapy
The attempted remediation of a psychological health problem, usually following a diagnosis.