Reminds me of the idea that I've always liked, that none of us ever see the same colors as anyone else. Say, what if I actually saw everything in an inverted spectrum from you? What I call red, you'd call green, what I say is black is white to you, etc. But if it's all internally consistent, how do we tell? I call the sky blue. You call the sky blue. We might be seeing different colors, but who's to know?
Color-blindness, of course, is the breakdown of this internal consistency. Because of the eye's deficiency in certain cells, yada yada yada, a person now can't tell green from red, for example, and we call them "color-blind" because the patterns aren't the same as our own.



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