Two spectators, Ginny and Dave, are asked to help with an experiment involving two decks of cards, one red-backed and one blue. Both decks are shuffled, and each spectator takes one. The spectators themselves each deal 12 cards face down from their respective decks. The rest of the cards are placed aside. No extra or additional cards are used. The red cards are openly and deliberately fanned so that Ginny can see all of the faces, and she is asked to merely think of one card. The fan is closed and tabled, and Ginny places her hand on top of this red packet. The packet of blue cards is then spread once more to show it only contains blue-backed cards, and Dave places his hand on this blue packet. Ginny concentrates on her mental selection. She then removes her hand from the red pile and she counts her cards face down – there are now only 11! Dave likewise counts the cards in his blue pile. He finds that there are now 13, and one of them has a red back! The 11 red cards are then turned face up, and all are fanned in front of Ginny. She is asked whether her mental selection is still there, and she finds it has vanished. Finally, the red card in the middle of the blue packet is removed and shown to be Ginny’s mental selection. Includes the instructions. Very good condition.
