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THREE-DIMENSIONAL MOTION PICTURES 77 the eyes, we find that In each case the object obtends an angle which is smaller, in the case of the equivalent viewpoints, than in the case of either eye viewing a par ticular object. Hence, as the angle obtended by an object is the sole factor which determines its linear dimension in an image, it is clear that all objects are seen narrower in binocular than in monocular viewing. The word "narrower" is used advisedly because vertically both eyes are on the same level and thus see the vertical characteristics of an object (and space) under identical angles. Therefore, as far as vertical phenomena are concerned, we might just as well have a single eye at point 3. Pausing here a moment, we might consider that in a single stroke we have unraveled part of the enigma of binocular vision. We find that in the perspective created binocularly there is but a single vertical center of vision or perspective; while there is a plurality of horizontal centers of vision, these being the equivalent viewing points for the two eyes for each and every object in a scene. We find, further^ that in the binocular perspective objects are imaged narrower than in the geometric perspective, because horizontally these objects obtend smaller angles than those obtended in the monocular, geometric perspective. We know also that objects to the right of center in a scene are seen, in the binocular perspective, from the left of center; while objects in the left of the scene are viewed from the right. However, the difference in angles oblended in the two different kinds of perspective may become so small as to be insignificant. This happens when this difference becomes less than the angle of the retinal curve obtended by a single visual element, because then no difference in dimension can be observed anymore, according to the