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Position yourself so that one of your eyes is close to a pinhole source
of light and carefully place some small object between your eye and the
pinhole, say, a pencil. On your retina the object's shadow will will be in
your field-of-view from the opposite side from the object's image.
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If the object moves into your field of view from below, then
its shadow will enter from the top. If the object moves in from the right,
it's shadow will come in from the left. (The object's image will be faint
and washed out but the shadow will be quite distinct.)
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