An Unsolved Riddle

In 1688, John Locke received a letter from scientist William Molyneaux posing a curious philosophical riddle: Suppose a blind man learned to identify a cube and a sphere by touch. If the shapes were then laid before him and his vision restored, could he identify them by sight alone?


Three hundred years later, it’s still an open question (Locke agreed with Molyneaux that the answer is probably no).

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