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Shades of Grey – 2009 novel by Jasper Fforde, a novel where social class is determined by the specific colors that one can see; Spectral color – Color evoked by a single wavelength of light in the visible spectrum; Tetrachromacy – Type of color vision with four types of cone cells, having four primary colors
The regions marked A and B are the same shade of gray. A region of the same shade has been drawn connecting A and B. The checker shadow illusion is an optical illusion published by Edward H. Adelson , professor of vision science at MIT , in 1995.
Eigengrau (German for "intrinsic gray"; pronounced [ˈʔaɪ̯gŋ̍ˌgʁaʊ̯] ⓘ), also called Eigenlicht (Dutch and German for "intrinsic light"), dark light, or brain gray, is the uniform dark gray background color that many people report seeing in the absence of light.
The horizontal bar appears to progress from light grey to dark grey, but is in fact just one color. Perceptual constancies are sources of illusions. Color constancy and brightness constancy are responsible for the fact that a familiar object will appear the same color regardless of the amount of light or color of light reflecting from it.
Color constancy: The colors of a hot air balloon are recognized as being the same in sun and shade. Example of the Land effect. Color constancy makes the above image appear to have red, green and blue hues, especially if it is the only light source in a dark room, even though it is composed of only light and dark shades of red and white.
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