Experts call this a "Sucker Die Box".
The yellow dice/block is placed into the box. The doors and sides are opened to show it has vanished.
Each unit comes with an extra block that can be used to "re-produce" the vanished block.
Box - 9 in. x 4 in. x 4.75 in.
Dice - 3 in. x 3 in. x 3 in.
New in the Box!