the flash light on the smartphone will light up

you can't go wrong

Look an Illusion

and one jumbo coin are used

by Harry Lorayne

Devil's Cups | Gabriel Werlen, Marchand de Trucs & Mindbox Bauer the flash light on theA 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