In order to test the hypothesis that the production of ears or wings on the horizontal angles of diamonds is due to an incapacity to preceive part-whole relationships, 9 Ss were asked to copy a diamond drawn in four colors. The effect of drawing this figure three times was to reduce significantly the number of wings drawn immediately afterward and in a follow-up. If this type of perceptual difficulty is related to brain damage in children, it would suggest that damage produces difficulties in part-whole integration and that special techniques are required to teach these children to produce geometric forms and other figures requiring part-whole integration.