Visual Illusion
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Print this figure on a sheet of paper and then give it a slight twirling motion as if you were swirling water around in a dish. The cog-wheels will appear to revolve slowly, while the other wheels turn rapidly in the opposite direction.
Keywords
Visual illusionGalleries
Visual IllusionsSource
Arthur Mee and Holland Thompson, eds. The Book of Knowledge (New York, NY: The Grolier Society, 1912)
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