Abstract: Observers taking different seat positions were asked to make judgments of distance between two stimuli. The results were then considered in reference to the retinal image transformations of the field caused by the angular displacement of the observers. It was found that as the seat position varied from 0° to 90° along an arc from the short axis of the field to its long axis, the perceived distance decreased first slowly, then quickly, and finally slowed down again. As great discrepancy existed between the perceptual effect and the changes in retinal projection, which underwent gradual transformations, it was stressed that the visual perceptual effect must be considered as one of the basis in the planning of seat positions in gymnasiums.

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