The generalization of "trained" creativity in easel painting to untrained creativity in blockbuilding was examined in two preschool boys. Verbal reinforcement of every different form painted in a picture increased both the number of different forms per picture and new forms (those appearing for the first time in the total output of paintings). The children's concurrent behavior in blockbuilding without differential reinforcement was also measured. There was generalization of form diversity from easel painting to blockbuilding in each condition of the study, but no generalization in the appearance of new forms. (Author/SET)