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THREE-DIMENSIONAL MOTION PICTURES 37 Analysis of the perspective we perceive shows that horizontally we see objects narrowed down and inter spaces widened. Further, we noted that ratios of width to height change with distance, and this change is part of the fund of experience utilized in our acquired per ceptions of depth and distance. The writer feels that this measuring rod, subconsciously applied, must be an important part of our mental visual armamentum. This interpretation of changing ratios between width and height, however, would be totally lacking in the quadrocular perspective, as can be easily proven by an analysis similar to that applied to the binocular or trimensional perspective. At best, it's a moot question just what kind of perspective should be adopted for photographic pur poses, with the final judgment doubtless reposing with the general public after having viewed one or the other kind of perspective. Trimensional pictures, the writer is certain, will replace the present geometric pictures as a matter of course. The trimensional perspective will lend a touch of amazing relaity to photographs and reproductions of any and all kinds whatsoever. The effects will be retained in the halftone process, will be universally used in illustrated magazines, and add immeasurably to the enjoyment of all pictorial work. In motion pictures the trimensional perspective will add the final needed touch of reality, particularly if a good color process is employed in making the films. As this perspective depends only on the optical char acteristics of the aggregate used as a camera objective, there would be no difference in treatment as between black-and-white and colored film.