Visual Illusion: Sloping Lines
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If you fix your eyes on the two white spaces between the lines it will appear as if the top space becomes wider at the ends, and as if the bottom space becomes wider in the middle. But both lines are perfectly straight.
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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