A study of the relationship between the behavior of preschool children (3-5-year age group) and the physical near environment has been initiated at Cornell. The illumination and sound levels, color, equipment, and spatial configurations in a nursery school room are to be varied, and systematic observational records will be kept of the level of play, the incidence of aggression, and the movement in and out of, as well as the movement within, the test area. (Author)