Any man worth his salt will stick up for what he believes right, but it takes a slightly better man to acknowledge instantly and without reservation that he is in error. - Andrew Jackson
Only a part of what is perceived comes through the senses from the object. The remainder always comes from within. Artists, architects, stage artists, magicians and camoufleur either take advantage of optical illusions or try to avoid them. They are vastly entertaining, useful, deceiving or disastrous, depending upon the viewpoint.
Included in the introduction is a history of optical illusions and an initial discussion on understanding optical illusions.
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