The outer ring appears to expand while the inner one appears to contract. This illusion depends on a variant of the Fraser-Wilcox illusion, which I call the "optimized Fraser-Wilcox illusion, Type IIa".pic.twitter.com/m4JTBkTUob
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I am an experimental psychologist who studies visual illusions as well as makes illusion artworks. #illusion #opticalillusion #perception #錯視
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The outer ring appears to expand while the inner one appears to contract. This illusion depends on a variant of the Fraser-Wilcox illusion, which I call the "optimized Fraser-Wilcox illusion, Type IIa".pic.twitter.com/m4JTBkTUob
Moreover, the rings appear to rotate in the different direction from each other when observers approach or move away from the image fixing their eyes at the center. This illusion is called the Pinna illusion.
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