A 2 X 2 factorial design requiring judgments of interobject distance was utilized which sepa­ rated the effects of magnification per se from the concomitant truncation of the visual field normally effected by optically produced magnification. Only the main effect of magnification was significant, and this was much less than the decreases optically specified by the decreased perspective and texture gradients. It has long been known that when an optic array reflected from a spatial layout is magnified, one ex­ periences some distortion in the perception of the radial distance between objects, the slant and shape of the surfaces of these objects, and the slant of the ground itself. Magnification of an optic array is pro­ duced by uniformly transforming all visual angles in that optic array by a factor greater than 1. When a picture is taken with a normal' lens and viewed from the proper station point for receiving the geometric center of the projection, there is no magnification. The proper station point is perpendicular to the center of the picture plane and at a distance equal to the product of the focal length of the lens utilized in tak­ ing the picture and the ratio of the diagonal of the enlarged projection on the picture plane to the diag­ onal of the slide or photographic film. However, if the picture is viewed from a position closer than the proper station point, the array reflected from the sur­ face of the picture plane will be magnified by a factor equal to the proper viewing distance divided by the closer viewing distance. The effects of magnification produced by this means upon the perception of dis­ tance within the depicted spatial layout has been in­