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The following summer was unusually warm, and I increased the verisimilitude of the [running] wheel as an infinitely long running space by arranging a fan so that it blew into the face of the squirrel. It was an old electric fan. The motor had gone, but I attached a pulley to the shaft of the blade and ran a belt to a larger pulley on the shaft of the running wheel. Whenever the wheel turned, the fan turned, at a higher rate. In a sense, the squirrel fanned itself as it ran. (p. 655)