This would give, of
course, a chaotic, blurring image. But if the apparatus which projects
the left side view has a green glass in front of the lens and the one
which projects the right side view a red glass, and every person in the
audience has a pair of spectacles with the left glass green and the
right glass red--a cardboard lorgnette with red and green gelatine paper
would do the same service and costs only a few cents--the left eye would
see only the left view, the right eye only the right view. We could not
see the red lines through the green glass nor the green lines through
the red glass. In the moment the left eye gets the left side view only
and the right eye the right side view, the whole chaos of lines on the
screen is organized and we see the pictured room on the screen with the
same depth as if it were really a solid room set on the stage and as if
the rear wall in the room were actually ten or twenty feet behind the
furniture in the front. The effect is so striking that no one can
overcome the feeling of depth under these conditions.
But while the regular motion pictures certainly do not offer us this
complete plastic impression, it would simply be the usual confusion
between knowledge about the picture and its real appearance if we were
to deny that we get a certain impression of depth.
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