Optical illusion, 19th century

Optical illusion, 19th century

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Caption: Optical illusion, 19th-century artwork. Array of white circles on a black background, the starting point for a demonstration of an optical illusion. The circles appear to be hexagons depending on how they are viewed, and this illusion persists even when the image is replaced with a grey screen. The illusion, which varies between the right and left eye, is thought to be caused be after-imaging effects in the brain, where curves are interpreted as corners and vice-versa. Artwork from the 13th volume (first period of 1894) of the French popular science weekly 'La Science Illustree'.

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Keywords: 1800s, 1890s, 1894, 19th century, after image, after imaging, annual volume, array, artwork, black-and-white, brain processing, circle, circles, european, experimental psychology, french, grid, hexagon, hexagons, historical, history, illustration, la science illustree, louis figuier, magazine, monochrome, neurological, neurology, optical illusion, pattern, persistence, popular science, processes, weekly

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