ECHO Sound

You place a piece of cardboard aside before a spectator shuffles the four cards from their own deck and spreads these cards face down on the table out of your sight.

After the cards have being mixed, they are put in different places. For example, under a phone, in a pocket, held between the hands and back in the deck. In spite of the very fair conditions, writen on the cardboard is a prediction of exactly what will end up where!