![]() ![]() A formalism called propositional dynamic logic is used to describe some of its logical aspects. ![]() We illustrate the value of this approach through an analysis of a simple close-up trick, Martin Gardner's Turnabout. This structure is conceptualized as two parallel event sequences: an effect sequence that the spectator is intended to believe and a method sequence that the magician understands as happening. We argue that this condition of impossibility is constructed not simply through misperceptions and misattentions, but rather it is an outcome of a trick's whole structure of events. A view is then presented of the logical nature of impossibility as an unresolvable contradiction between a perception-supported belief about a situation and a memory-supported expectation. Our account is first motivated by insights about the constructional aspects of conjuring drawn from magicians' instructional texts. We present a complementary analysis of conjuring tricks that seeks to understand the experience of impossibility that they produce. Psychologists and cognitive scientists have long drawn insights and evidence from stage magic about human perceptual and attentional errors. ![]()
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