Illusions regarding contrast and colour are primarily mainly because of the way the retina's rods and cones process data by their receptive fields. psychol a perception that isn't correct to fact, getting been altered subjectively in a way in the head on the perceiver See also hallucination Artwork is https://bookmark-media.com/story19851425/not-known-factual-statements-about-illusion-of-kundun-mu-online