This is not a spiral: what you see is a series of concentric circle and the reason is the so called Fraser spiral illusion : r/blackmagicfuckery
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Fraser-Spirale
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Fraser spiral illusion, false spiral, twisted cord effect. Pictures and descriptions. Explanation. … | Cool optical illusions, Optical illusions pictures, Illusions
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Fraser spiral optical illusion. Also known as the false spiral or the twisted cord illusion. The
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Akiyoshi Kitaoka on Twitter: "Concentriccaly aligned oblique line segments appear to form spirals. (Fraser illusion or the spiral illusion of the Fraser illusion) https://t.co/yoZ2pTdijp" / Twitter
Fraser's Spiral -- from Wolfram MathWorld
Fraser's spiral
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Fraser's spiral
Fraser-Spirale – Wikipedia
