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Stereoscopic,
or 3D photography, works because it is able to
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recreate the
illusion of depth. Human eyes are set some
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distance
apart, so each eye sees an image slightly differently.
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If one takes
two separate photographs that same distance
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apart, with a
suitable viewer it is possible to recreate that
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illusion of depth.
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Binocular
drawings were made by Giovanni Battista della
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Porta
(1538-1615), which clearly indicated his understanding
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of binocular
vision.
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In 1613 the
Jesuit Francois d'Aguillion (1567-1617), in his
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treatise,
coined the word "stereoscopique"
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