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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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00413_Text_res23at.txt
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1997-02-04
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UPRIGHT VISION FROM AN
INVERTED IMAGE Is it really a
problem that vision is upright
although the retinal image of
the scene is inverted? For once,
all students of perception agree
on an issue: It is not. If it were
the case that the scene did
appear inverted, a further
question would immediately
arise: With respect to what
would it appear inverted?
According to the definition of
egocentric orientation already
given, the scene would have to
appear upside down in relation
to the observer. But visible
parts of oneΓÇÖs own body produce
images on the retina, and these
images are also upside down. In
other words, the perceived
orientation of one thing
relative to another and of all
things relative to the visible
parts of the self are in no way
altered by the fact that the
entire retinal image happens to
be physically upside down. No
one has stated this fact more
clearly or eloquently than
Berkeley, almost three
centuries ago. (Berkeley is
talking about the inverted
image of another person, but
his reasoning would apply just
as forcefully to images of parts
of the observerΓÇÖs own body.)