It’s a great effect. The routine begins when the lady is concealed behind five small square pieces of a puzzle. These are slowly folded, slid and rearranged to form a cube—but as the audience realizes that the lady is gone, they realize that this odd puzzle is forming an amazing illusion. Her head emerges from out of the top of the tiny cube, and in this position the surrounding frame is completely opened and shown, so the audience realizes that they can see through the apparatus. Finally, with a quick fold, the lady disappears completely. At the finish, she reappears as the puzzle is taken apart again.