by 
Crumb Eye
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I once saw an exhibit at the Exploratorium (in San Francisco) in which an eyeglass-like frame held two pieces of glass of unlike colors. It was supposed to enable someone colorblind, or partially so, to see color differences, if not actual colors. I don't know how it was supposed to work. I tried it (I have slightly defective color vision, like some 30% of the male population) but couldn't decide whether it was making a difference or not. Incidentally, Oliver Sacks wrote an article about a painter who suffered cranial trauma (auto accident, I think) and made a complete recovery, except for totally losing his color vision. He went through considerable emotional turmoil, including contemplating suicide, but eventually came to believe that he was only changed, not diminished, and perhaps better off -- that losing color had taken away an overwhelming distraction from the perception of line and shape. It's a fascinating story -- Sacks never wrote a dull page -- collected in "An Anthropologist on Mars." (Not to be confused with a later book, "The Islands of the Colorblind.")
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