Spiegelbox

Here's what your audience sees. You open the front door of the box to reveal it's empty. But with a little magic and the help of your audience, you open the top lid of the box to find it full of sweets, long silk scarves, and flowers! Audiences of all ages love this effect, even when they know how it's done. It's that deceptive. 

Using this prop you are following in the footsteps of countless professional magicians, who've used similar boxes for several hundred years. Houdini used one (larger than this!) to produce an elephant on stage.