Color Illusion

There are numerous optical illusions that are not being answered yet. Optically human eyes may perceive things that are physically different from the reality. It is also known as Optical Illusion. Eyes see and the brain perceives. Often we find that what eyes see not necessarily matches with our perception. The information processed by brain does not tally with the physical appearance. Color Illusion is among those illusions that frequently we experience. However, we need to discuss in general the aspects of Optical Illusion before discussion on specific ‘Color Illusion’. Following are the three main aspects:

1. Literal optical illusions that create images that are different from the objects that make them,
2. Physiological ones that are the effects on the eyes and brain of excessive stimulation of a specific type (brightness, colour, size, position, tilt, movement),
3. Cognitive illusions, the result of unconscious inferences

(Read more: http://en.wikipedia.org/wiki/Optical_illusion ; June 5, 2012)

An illusion is not a contradiction between perception and physical reality; it is a contradiction between two or more perceptions.