You’ll have your spectators totally puzzled with this one – it’s obedient cube. The cube is only obedient to your commands! Show everyone that the cube slides freely on the cord. If you hold the cord vertically and let the block drop from the top, of course, the cube will quickly slide down the cord. You are the magician, and you have an “invisible helper” with you. Let everyone watch as you place the invisible helper into the cube. Now, when you hold the cord vertically, the cube stays at the top wait wait here comes the best part – at your command, the cube drops an inch or two, then stops, then drops a little bit more, then stops. Whatever you want it to do let your spectator choose a spot on the cord, and you can command the cube to drop and stop at the exact spot chosen of course, now your spectator will want to try it. But when he picks up the cord, the cube is again loose and quickly drops down to the bottom of the cord.