Devil's Cups by Gabriel Werlen, Marchand de Trucs & MindboxA diabolical method for finding a hidden object. You put four metal cups in a row in front of your spectator. You give him a die. While you look away, he freely hides the die under one cup without giving you any information. He then freely and secretly shuffles the cups. You are immediately able to identify under which cup the die is hidden. No electronics. No question asked. The participant can freely hide the die under any of the cups. The