This email is only partially off topic because we all work with color from time to time, whether we are using Leicas or any other camera. About twenty-five years ago, in the mid-1980s, I saw a BBC program on TV here in the U.S. called "Colourful Notions." The program concerned how we humans see color and how the conventional theory of color vision is not correct. It included an experiment by Edwin Land, of Polaroid fame, that demonstrates how color is actually perceived. For some reason that program was pulled from all the TV archives that I could find and I have searched for it over the years with no success. I now find that BBC's "Colourful Notions" is available in four parts on YouTube simply by searching there on "Colourful Notions." Here is Part 1 to get you started http://www.youtube.com/watch?v=4YuEhr-C-8U I hope Land's experiment will surprise and delight you as much as it did me roughly twenty-five years ago when I first saw it. With all best regards, Bill