The Magic Pendulum

To perform this focus, you need a pendulum, something like a metal ball on a string, and you need to prepare a deck of cards in a certain way. Scrape with a pin or a razor blade the part of a digit or letter that indicates the value of the map in the upper left corner of all cards. Before starting the focus show, unfold the deck so that the cards are turned to you. After that, let the viewer choose any card. While the viewer is reviewing it, you should turn the cards unnoticed so that the notes are facing the viewer. After that, ask to put the card in the deck between the other cards. Shuffle the cards without changing their orientation. Next, place the cards from left to right in an open view in a horizontal row. Then take the pendulum and draw them over the cards, when you see a card that does not have a mark, then lightly swing the pendulum, this will be enough to make the pendulum turn. In this way, the map chosen by the viewer will be found.