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THREE-DIMENSIONAL MOTION PICTURES 7 demonstration of what is known as binocular vision, seeing with two eyes. Our eyes are so set or placed that we are able to see around objects and estimate their lateral dimensions or solidity, to determine the shape of things, to appreciate the separation of objects al different distances and to see things in pleasing perspective. Close one eye and look about you and you find things become flat, just as the movies of today. Immediately upon opening the closed eye, you see things in perspective. That is the difference be tween the ordinary movies and Stereoscopic Pictures. The separation of the human eyes averages about two and three-quarter inches and each eye sees a dif ferent view. To see stereoscopically with our un aided eyes, we must view other than flat objects or planes. If, however, we produce two photographs of the same object, which photographs are flat, mount them side by side and use a stereoscope to view them, so that each eye sees one view only, we again reproduce the scene in relief. In fact, the relief may be in creased, within limits, over that normally seen with the eyes, by taking the two views from points further apart than the normal distance between the human eyes. The Stereoscope is an optical instrument "for uniting into one image two plane (or flat) represen tations as seen by each eye separately and giving to them the appearance of relief or solidity." "In 1841 Dove showed that if one of a pair of stereoscopic pictures is outlined in blue on a white ground, and the other element in red, the two being approximately superimposed upon the same sheet, a spectator furnished with red and blufc glasses will see the outlines as a single solid unit. In demonstrat-