If someone is blind from birth how do they visualise colours, we say the sky is blue, but what is blue?

Question:

Answers:
they can't visualize colors. You have to be able to see a color before you can understand it. But what difference would it make to a blind person, anyway? If they can't see anything, the perception of color is meaningless.

Other Answers:
good thinkin. i think they can see colors but the color names may get changed for them

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