If you have ever cracked a psychology text, you have seen it: two pictures, usually side-by-side, of a dark circle surrounded by other white rings. In one image, the circles surrounding the inner circle are significantly larger than the center one, while in the other, they are much smaller. Which of the two circles in the center is larger, we are asked. We know the answer, but incredibly our instinct drives us to declare that the black circle surrounded by smaller circles is bigger than the other one. They are, of course, of equal size. We have been duped by a modest mind-game.
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