Colorvision While the magician is not looking, a spectator places a cube with different color sides into an opaque box.
The spectator remembers the color on the top and then covers the box with the lid.
He then hands the box to the magician who holds it up his forehead so that he can get a better "feel" of the color.
He then names a color, and when the box is opened, sure enough the color the magician named is right on top.
Easy, foolproof and fully mystifying
