The Wonderful Wizard of Oz cap to summon the Winged Monkeys two more times. When Dorothy and her friends meet the Wizard of Oz again, Toto tips over a screen in a corner of the throne room that reveals the Wizard. He sadly explains he is a humbug—an ordinary old man who, by a hot air balloon, came to Oz long ago from Omaha. The Wizard provides the Scarecrow with a head full of bran, pins, and needles ("a lot of bran-new brains"), the Tin Woodman with a silk heart stuffed with sawdust, and the Cowardly Lion a potion of "courage". Their faith in the
Wizard of Oz experiment Louisiana, United States). CSC ’85. ACM Press, New York, USA, 292-297. Good, M. D., Whiteside, J. A., Wixon, D. R., and Jones, S. J. 1984. Building a user-derived interface. Commun. ACM 27, 10 (Oct. 1984), 1032-1043. Several dozen references here. Wizard of Oz experiment In the field of human–computer interaction, a Wizard of Oz experiment is a research experiment in which subjects interact with a computer system that subjects believe to be autonomous, but which is actually being operated or partially operated by an unseen human being. The phrase "Wizard of Oz" (originally "OZ Paradigm") has come into common usage