From VAS (271–272):
It’s sort of like whether or not you believe a flower changes color when you put out the lights. If by “color” you mean appearance (an artist’s conception), the answer is yes. If by “color” you mean chlorophyll (a biologist’s understanding), the answer is no.
You might have seen this shaded gray squares illusion before. Squares A and B are the same shade of gray.
See more color illusions here.
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