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80 THREE-DIMENSIONAL MOTION PICTURES Ing of the interspaces" is used advisedly, because,, ver tically, there still is no change in proportions, as m vertically the eyes are on the same level Expressed simply, we find that in binocular vision we look through the interspaces between objects from a multitude of points located in front of the eye base, and under wider angles,, so that, binocularly, we are enabled to see more of the background than is possible with either eye. Again, this increase of angle with which in binocu lar vision we look through interspaces, decreases with distance until, beyond the critical distance discussed previously, the difference in angles obtended by spaces becomes equivalent to zero. Hence this cause for stereo vision also ceases to exist at the critical distance. We are now in a position to define clearly the difference between the perspective seen in binocular vision and the geometric, or monocular, perspective. In the latter, there is but a single viewing center or center of perspective, i.e., the center of the eyeball, or the objective of a camera; while the former possesses three different kinds of viewpoints: first, a single center of perspective in the vertical sense, which may be said to be located at a point midway between the two eyes; second, a group of viewpoints for objects, located behind the eye baseline on the opposite side of the centerline to that on which the objects are located; third, a group of viewpoints located in front of this baseline from which interspaces are viewed, on the same side of the center line as these interspaces themselves. It follows that as a result of the widely different locations of these various viewing points, the binocular perspective is totally different from the monocular, geo metric perspective. As was shown, objects are slender ized, by a given percentage, which is greatest for nearby