Believe it or not, squares A and B are actually the same colour. The fact that they look different is a consequence of your puny mindpic.twitter.com/bb0Dxjfihc
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Perhaps there was a photo of a board in which the squares of the board were the same color but the lighting caused the colors to be captured differently? Just as "what color is this dress in the real world?" Is a far different question to what colors are on the dress in image?
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