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Illusion - Is Seeing Really Believing?
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Illusion - Is Seeing Really Believing (1998)(Marshall Media)[Mac-PC].iso
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ILLUSION
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00046_Text_re21t.txt
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1996-12-31
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(Top) Retinal image formed by
an object in a frontal plane: the
relative proportions between
points within the object are
maintained within the image.
(Bottom) Objects at different
sizes may subtend the same
visual angle if they are located
at different distances.
If an object is seen in the
frontal plane, the relative
proportions between points on
it are maintained within the
image, as shown in the top
figure to the left. The visual
angle, and consequently the
size of the image, will vary
systematically not only with
the size of the object viewed but
also with its distance from the
viewer. For example, a book
held at different distances in
your line of sight will cast
retinal images of different
sizes, the size of the image (or
the visual angle that produces
it) being inversely proportional
to the bookΓÇÖs distance from the
eye. This fact is sometimes
referred to as EuclidΓÇÖs law of the
visual angle.