Experimental studies of a perceptual anomaly

Abstract
Previous papers in this series (Shapiro, 2, 3, 4; Shapiro and Tizard, 6; Yates, 13 and 16) have been concerned with the investigation of an aspect of the reproduction of designs called the rotation effect. Rotation is the term used to describe the fact that subjects often, when copying a design, make their reproductions in an orientation which is different from that of the model (see Figure 1).