Interpretations of the Cafe-wall Illusion on the Basis of 3D Scene Perception and Production of Variations

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  • カフェウォール錯視の三次元的解釈と錯視パターンのバリエーション

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When we observe shadows cast by multiple cuboids on a 3D surface of varying depths (a“staircase object”) from a diagonal angle, the retinal image can contain patterns that cause a famous illusion, called Café-wall illusion. In this study, we show that the illusion occurs in the direction opposite the distortions of shape caused by perspective projection. This suggests that the Café-wall illusion, as well as other geometric illusions, can be interpreted as a malfunction in the estimation of three-dimensional (3D) scene geometry from information given by the images projected on the retina. In addition, based on these facts and additional observations using 3 D computer graphics, we created two-dimensional computer graphics that can cause variations of Café-wall illusion from models of 3D scenes consisting of a staircase object and various objects that cast shadows on it.

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