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@aaribaud yeah, isn't it interesting? So on the one hand, colors have a kind of objective neurological basis, if you can call it that. On the other, every color system influences how you perceive color. So if artists call a color warm or cold, you just might say no.

So I did mean synaesthesia, yes. But how to describe color to blind ppl? I dunno, maybe not at all. Of course it is valid to make a poem out of associations and reactions but you should tell them it's not actually what colors are like. I.e. blue can also feel warm or water can be green. Then they get confused, but anyway.

I guess you could also name many things that commonly have certain colors in certain light situations. This way they wouldn't understand the color, but they could maybe use this knowledge, i.e. for painting.