Textbook of Usability

Biophilic design is an approach to architecture and interior design based on the biophilia hypothesis: the idea, articulated by E. O. Wilson in 1984, that humans have an innate tendency to seek connections with nature and other forms of life. Built environments that incorporate natural elements are hypothesised to promote physical and psychological wellbeing.

Stephen Kellert and Elizabeth Calabrese (2015) identify three categories of biophilic design:

1. Direct experience of nature — plants, water, natural light, natural ventilation, animals
2. Indirect experience of nature — natural materials (wood, stone), natural colours and patterns (fractals, curves), images of nature
3. Experience of space and place — prospect (open views) and refuge (enclosed spaces), transitional spaces, organised complexity

The evidence base is stronger than it might appear. Roger Ulrich's landmark 1984 study found that surgical patients with window views of trees had shorter hospital stays, required less pain medication, and had fewer negative nursing notes than patients whose windows faced a brick wall. Subsequent research has documented:

• Stress reduction (cortisol, heart rate, blood pressure)
• Cognitive restoration — attention and working memory improve after nature exposure
• Pain reduction and faster recovery
• Improved productivity and reduced absenteeism in workplaces
• Better sleep and circadian rhythm regulation from daylight exposure

Biophilic design extends architectural usability beyond task performance to human flourishing. It is most developed in hospital and workplace design but has implications for schools, residential spaces, and urban planning.