Eli5: How do we know that all humans see the same color without any variation?

Question

Eli5: How do we know that all humans see the same color without any variation?

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Answer 1

Excluding people with color blindness and hyperchromatic vision, about whom we know that they see colors differently, there is no way to know that another person actually perceives the same colors in absolutely the same way as you. You can’t get into their head and see their view for yourself. And you and them might just be using the same word for, say, red color to describe different perceptions of the same actual color.