An instance of the Fraser spiral illusion: Concentric circles appear to be spirals.pic.twitter.com/x5RBwla9UF
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29時間で、いいね1400到達。私は一体何の記録亡者じゃ。それにしても、予想外のものが人気を博しました。
いいねが2000件を超えた。リツイートが700件を超えた。フツーのフレーザーの渦巻き錯視なのですけど。
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