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Our eyes are tricked into seeing something that is not really there or into seeing something happen
that did not really happen. Illusions can be deceiving, and magicians use illusions to
their advantage to make the audience believe that something happened by magic. Optical
illusions tell a story about how our eyes and brain work together to allow us to see.
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When a person looks at an object of a particular color for a long time and then suddenly looks at a blank space, the person sees a ghostly outline of the object in its complimentary color. Such as the Jesus illusion that everyody has seen.
http://www.eyetricks.com/jesus.htm
The Occipital Lobe part of the brain is our Visual Perception System. Visual illusions (distorted perceptions) can take the form of objects appearing larger or smaller than they actually are, objects lacking colour or objects having abnormal colouring.
