Incredibly, both A and B are the same shade of grey. These type of optical illusions usually just use simple contrast to fool the brain, but this illusion employs two effects. First of all, it plays tricks on the mind thanks to the dark shadow contrast around B - but the effect is reinforced by the bright white background contrast near A.With some 'training', it is possible to see both A and B as the same shade, but otherwise you might want to import the picture into a paint package to prove it to yourself
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