A cube with two strings that flow through it is shown to the audience and inserted inside an elegant cabin. After closing the door of the cabin, the magician ties two ends of the strings on the roof of the cabin. Two spectators hold tight the strings and the magician, in a moment, manage to free them making them penetrate the cube and the cabin with a rap. 
• Everything can be examined. Both cabin and cube are made of wood.
• The cabin is approximately cm 10 high and the base has a diameter of cm 10. The cube measures cm 4,5 per side.