Riddles intuition or 21 cards

This focus magician learns card that mentally conceived the viewer. Still quite an old trick, which is known to many people. It consists of the following. Magician lays out 21 card on the stack 3 to 7 cards in each stack. Then the viewer conceives one card and shows what the stack is this card. Then the magician collects the 3 cards stack together so that a stack of cards was conceived in the middle. After that, the card re-rented one for 3 stacks of 7 cards in each stack and shows the viewer what he conceived stack card. Pile going again so that the middle was a package with a map viewer. This process is repeated once more. That is only 3 times. As a result of this map, which conceived the viewer will be the eleventh top. Purely arithmetic focus.
This focus, preferably after the show focus couple pair . 15 used cards you set aside and take the rest of the deck, which is located just 21 cards. Setting aside fifteen cards can be motivated by the fact that for the next focus on the intuitive perception you need fewer cards. Balance the deck can be given to the audience and ask them to shuffle, then ask the spectator to deploy cards face to himself and mentally choose and memorize any card, then shuffle. Next, the viewer gives you a card and you are distributing them on the stack 3. Then ask the viewer to focus and intuitively determine what pile is his card, the viewer takes a stack of cards and look whether there is his card in the stack. If his card in that pile there, then just say that the viewer sharpened intuition, if the viewer did not guess, that give it more time to find his card. Then connect all 3 cards of the stack so that the stack of cards with the viewer was in the middle. Then tell the audience that the purity of the experiment, do the same thing 2 more times. The third time is not the viewer guessing where his card, as you guess.