An optical illusion is characterized by visually perceived images that differ from objective reality. The information gathered by the eye is processed in the brain to give a perception
that does not tally with a physical measurement of the stimulus source.
There are three main types: literal optical illusions that create
images that are different from the objects that make them, physiological
ones that are the effects on the eyes and brain of excessive
stimulation of a specific type such as brightness, color, size, position,
tilt, movement, and cognitive illusions, the result of unconscious inferences.
http://www.youtube.com/watch?v=tVgOLWVYytM
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