The irradiance illusion, often referred to simply as the "irradiation illusion," is a phenomenon in visual perception where areas of an image seem to emit light or appear to be brighter than they actually are due to the surrounding visual context. This illusion can make certain colors or brightness levels appear more intense when placed against contrasting colors or brightness levels. One classic example involves a white object placed against a darker background, which can cause the white object to seem brighter or "radiate" light.
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