From Dover Publications : What is a self-working card trick? A trick that does not depend upon legerdemain or special abilities on the part of the magician, but a trick that works automatically because of the mathematics inherent in the card deck itself. Long practice and supernormal dexterity are not needed to perform these tricks, yet they are often among the most entertaining and most spectacular of all card tricks. Some of these sure-fire tricks are simple, a good place to begin.
