We can quantify Biophilia through the Biophilic Healing Index. This gives a percentage score evaluation of how biophilic a design actually is, which combines estimates for ten separate biophilic qualities. Here are the background references:

https://www.terrapinbrightgreen.com/report/biophilia-healing-environments/

https://applied.math.utsa.edu/~yxk833/BiophilicIndex.pdf

Estimate ten geometrical plus natural qualities listed below according to the scale: 0 = none, 1 = some, 2 = a lot:

B1. Sunlight: preferably from several directions.
B2. Color: variety and combinations of hues.
B3. Gravity: balance and equilibrium about the vertical axis.
B4. Fractals: things occurring on nested scales.
B5. Curves: on small, medium, and large scales.
B6. Detail: meant to attract the eye.
B7. Water: to be both heard and seen.
B8. Life: living plants, animals, and other people.
B9. Representations-of-nature: naturalistic ornament, realistic paintings, reliefs, and figurative sculptures — including face-like structures.
B10. Organized-complexity: intricate yet coherent designs — and extends to symmetries of abstract face-like structures.

Sum the values for the above biophilic components to define the index B as a number out of 20. For B as a percentage score, simply multiply this total by 5. A quantitative measure of the degree that a design is biophilic is more useful than the usual vague discussions based on images showing potted plants. The more biophilic it measures on this scale, the more a building will contribute positively to the users’ health. This phenomenon has been established by medical measurements. And the whole point is to compare different buildings and competing designs to check their biophilic qualities before they are funded.