Color, light & materials applied as a composition through unity &/or variety connecting with nature.  
(e.g., variety of natural materials used throughout with a unified color scheme)

COMPOSITION

Research

1. Colored lighting affected perceptions (Odabaşioğlu & Olguntürk, 2015)

2. Plants, visual posters and organization influence how people feel and how they see the owner of the space (Campbell, 1979)

References

Campbell, D. E. (1979). Interior office design and visitor response. Journal of Applied Psychology, 64(6), 648–653.

Odabaşioğlu, S., & Olguntürk, N. (2015). Effects of coloured lighting on the perception of interior spaces. Perceptual & Motor Skills, 120(1), 183–201. https://doi.org/10.2466/24.PMS.120v10x4