The magician shows a plastic ledge with three vertical borings.
Three ropes are pulled through these borings, at the right side a silk is firmly tied up.
The magician pretends to be able to let the silk move from the right rope to the left one. For this reason, he takes the ledge behind his back for a moment - really - the silk is on the left rope. Repeating this several times, the spectators will be convinced that the magician simply turns the ledge behind his back and that the silk "jumps" from one rope to the other in this way. The magician will certainly be requested to let the silk move onto the middle rope. Immediately and without hesitation, the silk will jump onto the middle rope.