SWITCH! Magic Trick Tutorial
From the desk of David Britland
There is a genre of mathematical tricks in which you appear to control and predict the actions of a spectator. For example, the spectator mixes around three cups. Under one is a banknote. Even though you cannot see the cups, you always know which cup hides the banknote. The method is simple and sure-fire. What makes the system worth knowing is its versa…