The box is a mechanism! ! ! ! At the beginning, the performer prepares a card in advance, such as the King of Hearts, tears off a part of the King of Hearts (this part is less than a quarter of the entire card), and then hides this part in his hand, and the other part Put it into the box mechanism.

(Again, the mechanism is like this: the box is double-sided, with a splint in the middle. One side of the deck has the function of a magnet, but the other side does not.) Put the other part into the side of the box that does not have the function of a magnet. . The preparation is complete.

During the performance, the performer will use special props or forced selection to allow you to choose the cards he has prepared. Here is the King of Hearts, and then you will be asked to shred the cards. At this time, he will take the opportunity to mix in another small part that he has hidden in his hand, and then he will say, pick a large or relatively complete piece for you to hold. It is forced on you, and then you take that piece. The piece is the one he prepared in advance.

Finally, just put the fragments on the side with the magnet, cover the box, and the magnets will attract each other. Cover the broken card, and then naturally the other part of him that has been prepared in advance appears on the other side.

Putting the two parts of the box together must be the same, because it was prepared by the performer in advance and was not torn by you.

This magic happened a long time ago, but it was still very magical at the time. I hope the poster can understand.