21 Card Trick
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The first card trick learn by many beginners.
This is an old mathematical effect based on principles developed by Joseph-Diez Gergonne (a French mathematician) called the Gergonne Pile Principle.
- How to have someone think of a card and guess what it is in Giochi de Carte by Horatio Galasso (1593)
- 21 Card Trick Streamlined by Ed Marlo in The Cardician (1953)
- Nouveau 21 Card Trick can be found in Marlo Without Tears (1983)
- Jim Swain's handling in 21st Century Card Magic (1999)
- The World's Most Obscene 21 Card Trick in The Little Egypt Book of Numbers by Steve Bryant (2004)
- Tom Craven's 27-Card Trick, in Best Of Friends, Vol. 3, written by Harry Lorayne (2007)
- Jon Racherbaumer's ebook, The 21-Card Trick: Rigged, Reconsidered, and Retro-fitted (2007)