Magician shows two sets of 6 cards. Printed on the other side are dice pips from 1-6. Magician takes the blue set and makes a prediction on what 2 cards the spectator will select. These two cards are inserted face down into a 4 part window. Once inside, the choice can not be changed.

Once the spectator chooses two cards, they are inserted into the window face up. The window is flipped over to reveal that the magician's prediction matches!