The effect is a classic. The cabinet is placed over a spectator's head. It rests on his shoulders. You can see right through the cabinet from front to back. The spectator's head almost fills the interior of the box. Close the front and back doors. Thrust 15 daggers into the box. Open the front door. The daggers are still there, but the spectator's head has vanished. Close the doors. Remove the swords. Open the doors. The spectator's head is back. Remove the cabinet. He is as good as new ... completely unharmed.