Third Dimension Movies And E X P A N D E D Screen (1953)

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32 THREE-DIMENSIONAL MOTION PICTURES the action of the eyes, gives us the impression that the object we are staring at is a long distance away. An act of mind alone, however, may give one the idea of nearness or distance, as can be proved with the following experiment: A B Illustrating the Action of tlie Mind in Judging of Appearance. All parts of the illustration, figure A, are evidently in the same plane, but the inner square appears farther off or nearer than the outside square, just as one's mind thinks of it. If you think the inner square is farther away, you unconsciously call up the resemblance of a room with a square wall at the end, and the floor, ceiling, and the two sides sloping toward it; on the other hand, if you think the inner square is nearer to you than the outer square, it is because you think you are looking on a pyramid with its top cut off. The source of the effect in each case are the con verging lines which join the corners to the two squares. No effort of mind can remove the impression that in figure B the inner square is in the same plane as the outer square. Yet the squares in both figures are pre-