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Here's an effect that excites audiences! 

Your spectator first selects an item on the table, or selects a card. Then, the spectator can transmit through their mind, and the pointer instantly points to the item or card that they selected. The pointer will stop at a certain position during the movement, and then open precisely at the selected item. In addition, the roles can be exchanged -- the audience member thinks about their card, and tries to mentally send it to the pointer. After opening, the inside of the pointer shows the very card that was selected!