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76 THREE-DIMENSIONAL MOTION PICTURES looking cross-eyed at a very small object at a distance about equal to or somewhat less than the interpupillary distance of the eyes. In the diagram two eyes> 1 and 2 represented by dots are placed rather close together and look at objects A, B and C in a scene placed at an appreciable distance from the eyes. The figure represents a top view of eyes and scene; the objects, shown as circles, might be three round tables or have any other conceivable shape. When both eyes look toward object A, it is clear that left eye 1 will see more of this object on the left side, and, conversely, that right eye 2 will see more of this object on the right side. This is apparent from the lines of vision drawn through the two eyes tangent to object A. Obviously, the two extreme lines of vision embrace more of the object than the lines of vision of either one of the two eyes. When now we extend these two extreme lines of vision,, we find that they cross each other at point a located behind the eye base and on the side of the centerline opposite to that in which the object is located. Now, if a single eye were placed at this crossover point a, it would view object A while embracing as much of its girth as do the two eyes 1 and 2. Thus point a may be designated the equivalent viewing point for eyes 1 and 2 with respect to object A, because from there a single eye sees the object along the extreme, lines of vision of the two eyes. The extreme lines of vision for the two eyes viewing object B reveal the existence of another equivalent viewing point, b; and similarly we find an equivalent viewing point c for object C. Looking at the lines of vision from these equivalent viewpoints, and at the lines of vision from either one of