Yuval Barkan and Hedva Spitzer

An afterimage in general is an optical illusion that refers to an image continuing to appear after exposure to the original image has ceased. Prolonged viewing of the colored patch induces an afterimage of the complementary color (for example, yellow color induces a bluish afterimage). Simultaneous contrast is a psychophysical phenomenon of the change in the appearance of a color (or an achromatic stimulus) caused by the presence of a surrounding average color (or luminance).

The current illusion, color dove illusion, induces an illusionary color, similar to the original background, within the shape. This illusion can occur even when the colored surrounding area is relatively small, and is presented only for a short duration. This illusion might be produced by each one of the following independent mechanisms.

See illusion at http://birdillusion.biz.nf/

Second prize in best illusion of the year 2009 

Publication in "Scientific American" 

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