If you want a beautiful and visual stage magic, where the effect is clear and visible - then you should consider this little illusion that works equally well on children and adults.
The magician shows a transparent square box containing 8 balls. He takes the balls out one at a time and puts them in a black box. The lid is then put on the transparent box, and the box is then covered by a scarf. The box with the balls is closed while the magician says a spell. Once opened, all 8 balls have disappeared! The cloth is lifted from the transparent box and yes it is true - the balls have returned!
You can even let two spectators hold the black box and the transparent box respectively while the balls "teleport" from one to another. The ball appear so quickly in the transparent box that you do not even need the scarf!
A first-class prop that will impress in any performance.