Shadows emerge from a once empty box to reveal your Assistant!

Wheel out a box on stage make a complete circle with it to show all of its sides. Then open the box up and show the inside empty as well. Take a light, shut the door and show it still empty inside by shining the light inside. Then take your light and bring it all the way around the box, mind you if anyone was in and or around the box you would see their shadow. Then turn off the light and return it to the top of box and seconds later the light gets turned on by its self. Then the audience begins to see the shadows of someone in the box! And then your assistant appears from within the once empty box!