Reports two experiments in which plain blocks of various sizes were presented in various spatial orientations to children three-eight years old in an attempt to establish how they represent three-dimensional spatial relations pictorially. Results showed that young children represented depth in the array vertically in the picture plane. (RH)

Reported are three series of experiments analyzing the development of the visual function of infants. The first experimental series was aimed at the investigation of infants' reaction to moving objects. The second experimental series dealt with the analysis of the development of binocular vision in infants. The goal of the third series was to…

Traces the development of artistic ability in a six-year-old boy with autism and mild mental retardation. Addresses questions concerning autism and artistic development including whether intellectual realism is a necessary precursor to visual realism and whether a two-dimensional photographic memory is used as opposed to three-dimensional…