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This article may require cleanup to meet Wikipedia's quality standards. Please improve this article if you can. The talk page may contain suggestions. (March 2009) This article needs additional citations for verification. Please help improve this article by adding reliable references. Unsourced material may be challenged and removed. (March 2009) White's illusion White's illusion is an optical illusion illustrating the fact that the same target luminance can elicit different perceptions of brightness in different contexts. Note, that although the gray rectangles are all of equal luminance, the ones seen in the context with the dark stripes appear brighter than the ones seen in the context with the bright stripes. Note that this effect is opposite to what would be expected from a simple physiological explanation on the basis of simultaneous contrast (in that case the rectangles sharing the long borders with the dark stripes should appear brighter). To see that the gray bars are the same color, you can stare at the image until your eyes begin to cross, then control your eyes until the gray bars line up, making one big gray bar, proving that the gray bars are the same color. An even more extreme example is an overhead projector screen, which is bright white in reality but whose less-illuminated regions appear black. Note that this is an effect of simultaneous contrast, not White's illusion, per se. BBISVIP Wikimedia Commons has media related to: Optical illusion References B. L. Anderson, "Perceptual organization and White's illusion", Perception, Vol. 32, pp. 269-284, 2003 C. Chubb, G. Sperling & J. A. Solomon, "Texture interactions determine perceived contrast", Proceedings of the National Academy of Sciences, Vol. 86, pp. 9631-9635, 1989 A. Gilchrist, "Seeing black and white", Oxford University Press: New York, 2006 S. S. Gindy, "Techniques for subjective colour measurement and their application to colour contrast phenomena", London University, London, UK, 1963 P. S. H. Henry, "Colour", The Shirley Link (journal of the Cotton, Silk and Man-made Fibres Research Association), pp. 1-4, Summer 1969 H. Munker, "Farbige Gitter, Abbildung auf der Netzhaut und übertragungstheoretische Beschreibung der Farbwahrnehmung", Ludwig-Maximilians-Universität, München, 1970 M. White, "A new effect of pattern on perceived lightness", Perception, Vol. 8, pp. 413-416, 1979 M. White, "The effect of the nature of the surround on the perceived lightness of grey bars within square-wave test gratings", Perception, Vol. 10, pp. 215-230, 1981 M. White, "The assimilation-enhancing effect of a dotted surround on a dotted test region", Perception, Vol. 11, pp. 103-106, 1982 M. White & T. White, "Counterphase lightness induction", Vision Research, Vol. 25, pp. 1331-1335, 1985