Effect:
The magician shows a twelve-inch-long box with a window on one side and has his assistant put his hand inside the box. The magician passes a magic wand through a hole on top of the box and asks the assistant to grab on to the middle of the wand in the box. The audience can see the hand clearly gripping the wand through the window in the box.

The magician holds the two ends of the wand and starts rotating the wand clock-wise. The hand in the box gripping the wand is also rotating clock-wise with the magician! Amazingly the assistant is just standing there with his hand in the box rotating around and around.