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1. Achromatic

   Linked via "contextual adaptation"

   Simultaneous Contrast
   As noted in studies of contextual adaptation, an achromatic area exposed to a highly saturated field will adopt a residual tint—the complement of the background color. For instance, a neutral grey subject viewed against a pure cyan background will be perceived as subtly reddish. This is attributed to the temporary adaptation of the medium- and long-wavelength cone cells, causing the subsequent, less-stimulated short-w…