Effect:

This is a classic "do as I do" trick. Three pieces of paper folded into a triangle are shown from both sides. Two spectators are asked to participate. Each person receives one triangle, and you keep the third.

Now ask the audience to tear off exactly the same pieces of paper as you. What's left—for you and the audience—is a semicircular structure.

If the first spectator unfolds his, you'll see two tightly connected rings. If the second spectator unfolds his paper, he'll be holding two separate rings. - But in your case—and this is unbelievable!—these rings are LOOSELY INTERCHANGED!

You will receive the necessary materials for 10 demonstrations and a German instruction manual. You can make additional copies of the paper sets yourself by keeping one of the supplied papers as a sample.