"Art is a trait so universal and ancient that it is almost surely innate"
Ellen Dissanayake
The instinctive beauty gene, like the blackbird's orange-yellow beak, may have developed as a fitness signal. Making pictures is a non heritable brain disorder of unknown etiology, because aesthetics is part of our biology as expressed through the filter of irony. The art form rapidly evolves and mutates in unexpected ways. Observations indicate that all aesthetic theories are not equal in the eyes of evolution.
Biologists believe that some artists send mixed signals. Canvas with brightly coloured topsides attract mates, for example, whereas camouflaged undersides protect against art predators.
Art and genetics are good mysteries. Visual art moves from an esoteric specialty to being part of genetics. The criteria for goodness and badness are inherently shifting and not innate.
Donald Kuspit, Explaining why you do art because of an inner compulsion
Art works as fitness indicators.
G. F. Miller