File:Op-art-4-sided-spiral-tunnel.svg - Wikimedia Commons | Optical illusions art, Illusion art, Art optical
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Art
an image of a black and white optical illusional pattern that appears to be distorted
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File:Op-art-4-sided-spiral-tunnel.svg - Wikimedia Commons

An "Op art" looking spiraling four-sided tunnel generated by an extremely simple iterative mathematical transformation: Draw a square, then inside that square draw a smaller centered square in negative color rotated by 5°,
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