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Fechner color is an illusion of color seen when looking at certain rapidly changing or moving black-and-white patterns. It is most commonly demonstrated with a device known as Benham's top. The effect was noted by Gustav Fechner and Hermann von Helmholtz. The perceptual mechanism of Fechner color is not entirely understood.
External links
Online Java demonstrations of Fechner color (http://dogfeathers.com/java/fechner.html)
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