![]() "Border locking and the Café Wall illusion" (PDF). "The illusions of the kindergarten patterns" (PDF). Contrast polarities seem to be the determining factor in the tilt's direction. But a component of the illusion remains even when all optical and retinal components are factored out. In the first attempt at its deconstruction, the illusion was ascribed largely to the irradiation illusion (apparent greater size of a white area than of a black one), and the image disappears when black and white are replaced by different colours of the same brightness. In the construction of the optical illusion often each "brick" is surrounded by a layer of "mortar" intermediate between the dark and light colours of the "bricks". It is a variant of the shifted-chessboard illusion originated by Hugo Münsterberg. According to Gregory, this effect was observed by a member of his laboratory, Steve Simpson, in the tiles of the wall of a café at the bottom of St Michael's Hill, Bristol. It was first described under the name Kindergarten illusion in 1898, and re-discovered in 1973 by Richard Gregory. The café wall illusion is a geometrical-optical illusion in which the parallel straight dividing lines between staggered rows with alternating dark and light "bricks" appear to be sloped, not parallel as they really are. ![]() The horizontal lines are parallel, despite appearing to be at different angles to each other. ![]()
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