EFFECT: A spectator selects a card from an ordinary deck. The performer displays a small solid crystal cube, explaining that it will condense and focus thought rays, just like a lens focuses light rays.
 
The cube is held between finger and thumb, right under the spectator’s nose, and since it’s completely transparent, everyone can see there’s nothing inside.
 
The spectator is asked to concentrate on the selected card as the performer moves the cube forward and backward, twisting it to bring it into focus. Suddenly, an image of the selected card appears in the center of the cube, clearly visible to the spectator. Just as suddenly, the image vanishes, and the cube can be tossed out for examination.
 
The effect can also be performed to reveal a selected number, word, or design inside the cube.  Includes 2 gimmicks and several options to change the card or picture.  It would also be easy enough to create your own design.