From Steve Jobs talking in 1985 I learn something about color vision:

"You know, Dr. Edwin Land was a troublemaker. He dropped out of Harvard and founded Polaroid. Not only was he one of the great inventors of our time but, more important, he saw the intersection of art and science and business and built an organization to reflect that. Polaroid did that for some years, but eventually Dr. Land, one of those brilliant troublemakers, was asked to leave his own company—which is one of the dumbest things I’ve ever heard of. So Land, at 75, went off to spend the remainder of his life doing pure science, trying to crack the code of color vision."

Googling on Land's color vision work:

http://www.greatreality.com/Color2Color.htm

http://en.wikipedia.org/wiki/Retinex

Neat.