Adrian Gostick & Scott Christopher. Temple Grandin: The world needs all kinds of minds. Tinkerbell effect. The Tinkerbell effect is an American English expression describing things that are thought to exist only because people believe in them.
The effect is named for Tinker Bell, the fairy in the play Peter Pan who is revived from near death by the belief of the audience. See also Best Teacher I Ever Had. Best Teacher I Ever Had by David Owen Extracted from Reader's Digest (Asian Edition), April 1991, pp. 47-48.