(p. 228) Along with the home projector, the company introduced a central clearinghouse for used films, which offered customers a way of replenishing the family’s entertainment supply by using the postal service to swap titles with others for a nominal processing fee. Edison, however, wanted to use his projector not for entertainment but for education. For preschoolers, his idea was nothing less than brilliant. For teaching the alphabet, Edison explained in an interview, “suppose, instead of the dull, solemn letters on a board or a card you have a little play going on that the littlest youngster can understand,” with actors carrying in letters, hopping, skipping, turning somersaults. “Nothing like action–drama–a play that fascinates the eye to keep the attention keyed up.” (A prospectus for Sesame Street could not have made a better case.)
Stross, Randall E. The Wizard of Menlo Park: How Thomas Alva Edison Invented the Modern World. New York: Crown Publishers, 2007.
(Note: italics in original)