It is one thing to understand what advantages an animal such as ourselves gains by being able to exploit spectral information in its environment, but quite another to understand how the animal benefits by having conscious color experiences. Since experiences are private, how could they confer a selective advantage? Could they do so by enabling voluntary action of a sort forever beyond the resources of the most ingeniously designed wavelength-processing robot? Or is there an ancient biological link between color experience and the emotions that colors evoke in us?
Clyde L. Hardin,
"Color experience and the human animal", Proc. SPIE 4421, 9th Congress of the International Colour Association, (6 June 2002); doi: 10.1117/12.464751; https://doi.org/10.1117/12.464751