Eli5: How do we know that all humans see the same color without any variation?
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A portion of humans do have different types of color blindness, some more significant https://en.wikipedia.org/wiki/Color_blindness
https://en.wikipedia.org/wiki/File:Color_blindness.svg
https://www.google.com/search?q=color+blindness+types&tbm=isch&
We can compare baselines using color palates or objects as reference. https://www.aoa.org/healthy-eyes/eye-and-vision-conditions/color-vision-deficiency?sso=y
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