[MacDorcha]

Well, for one thing, if you wish to call "man" an animal, I will allow it for this discussion. (Seeing as I cannot know what an animal thinks)

I know a guy who is color-blind to blue. He knows a beautiful day when he sees it out his window though. He's reacting to the appearances without reacting to color. But how does he know its beautiful? It's gray to him!

[js1138]

Here's a web site that attempts to show what it is like to have various kinds of color blindness. I think the examples are bad, and I think some of them are incorrectly labeled, but it's a start. Your friend with protonopia does not see everything as shades of grey. He just sees colors differently, and he will label some colors differently from you.

If color exists independently of the eye and brain, why will some people say that two color chips match exactly, and other people say they don't?