Problema

The magician shows an elegant wooden box containing six black dice arranged in order from 1 to 6 and he closes it with a lid. He then hands over to a spectator dice cup, or any simple little cup (not supplied) with a die inside, inviting him to shake it and turn it upside down over the box, so that a casual number is selected from the die. Unbelievably , when the magician removes the lid, all the dice will now show the exact same number previously selected.