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Gustav Fechner
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=== The Fechner color effect === [[Image:Benham's Disc.svg|thumb|right|250px|A sample of a Benham's disk]] In 1838, he also studied the still-mysterious perceptual illusion of what is still called the [[Fechner color|Fechner color effect]], whereby colors are seen in a moving pattern of black and white. The English journalist and amateur scientist [[Charles Benham]], in 1894, enabled English-speakers to learn of the effect through the invention of the spinning top that bears his name, Benham's top. Whether Fechner and Benham ever actually met face to face is not known.
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