「不気味なフレーザー錯視」 Rows are aligned horizontally, but the uppermost and third ones appear to tilt counterclockwise while the rest clockwise.pic.twitter.com/X3IpYUaK5v
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It is supposed that local tilts make an apparent global tilt of the same orientation. It is called "Fraser illusion" (Fraser, 1908).
Fraser, J. (1908) A new visual illusion of direction. British Journal of Psychology, 2, 307-320.
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