The four aces are shown, turned over and placed faced down underneath the card box. Four cards are pulled from the deck at random and one by one are shown to be turned into aces, via different methods (Methods are subject to change depending on spectator.) The four, newly transformed, cards are placed face up next to the box and the four cards underneath the box are shown to have, at some point, turned into kings. Variation: Same thing only the four cards at random are all preset up blanks, and the cards under the box are shown to have turned into blanks rather than kings. What is this effect called or does anyone know of a similar one?