Not symmetrical.
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Why does it work?

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Kitaoka, A. (2014). Color-dependent motion illusions in stationary images and their phenomenal dimorphism. Perception, 43(9), 914-925.
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これはウニウニの陰影を反対にすれば反時計回りに回って見えるんでしょうかねえ。
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For me, it’s counterclockwise.
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Actually, counterclockwise rotation was supposed to be observed in dark conditions.
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doing something wrong, after 17 years later this one just vibrates and jiggles a lot. :)pic.twitter.com/bYrlwgKlqO
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Professor Kitaoka, being aware you use some graphic programs but was wondering if you ever tried some tile/math programs?
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