Richard J. Davidson, Susan C. Levine, Jerre Levy, and John Metz for encouragement, support, and for sharing their ideas in many invaluable discussions. Marie Ifollo, art coordinator and teacher, Park Forest, IL, was an inspiration to me, and she and the teachers and staff at the University of Chicago Laboratory School generously donated their time and their students' artwork. I am also obliged to the Laboratory School library staff for allowing me unlimited access to their collection. Finally, I thank all the independent study students who participated in various phases of the research.
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