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If there's a blind man who was blind since birth, he learned to distinguish between a Cube and a sphere by touching them. Let's say he suddenly gets his eyesight and then he tells which one is a Cube and which one is a sphere without touching them. That's the question. Many might say. Yes, it is simple because he has seen the edges, he has seen the plane surface. He might know but he doesn't know that. He knows how the plane surface feels
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