Looking through the menu, Cliff thought about the colors of edible food here. Evolution geared animals and people alike to like the colors of things that were good or benign -- blue for skies and clear water, white for snow. People disliked browns and dark colors linked to feces and rotten food, and reds that might mean spices or poisons. Plants had evolved those as warding-off signals.Compare and contrast with Palmer & Schloss (2010):
Taylor, Clifford & Franklin (2012):
Taylor et al. (2013):
Note use of blue to make cover art attractive
Certain primates have evolved the neat hack of seeing red, and find it attractive, because tropical plants use the colour as an attractant to indicate the ripeness of fruit and the propagation-worthiness of their seeds. I shall hie me now to the Fainting Couch.