[Terr_]

Seeing all those two-tone walls with green blow and cream above, I bet it isn't coincidental that those tones resemble plants under an overcast outdoor sky.

Either because of unconscious choice, or because some designer theorized that people would be biologically primed to prefer it.

[d-us-vb]

The purpose stated in the article in the mind of Birren was to reduce eye strain. I don't think it's so much that humans "prefer" it as such, more that we're very well adapted to work in environments with lots of it.

[djmips]

Good thought! See also the Go-Away Green comment. https://en.wikipedia.org/wiki/Go_Away_Green