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Originally Posted by TriangleMan
It comes down to psychologists currently lacking the means of determining if two people perceive the exact same colour when they look at an object. I don't have any links but if you do a Google search for this issue you may find a lot of discussion in Psychology journals about it.
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No, it's been determined. They do not.
How do I know? Because even one person (me) doesn't perceive the same thing each time--here's the
Checker Shadow Illusion created by
Ed Adelson. No way do squares A and B look the same to me!
And it's easy to prove that they are. Just copy the image into a paint program, and drag one box over next to the other. They are identical.