The magician takes a long-stemmed glass and announces that he's going to perform a card trick. The thing about this card trick is that he wont be able to touch the cards, because they'll be inside the glass the whole time!
Placing the pack, face out in the glass, the magician states that he's going to find all four aces using special "Locator Cards". He reaches into the glass and pulls out a red number card (we'll use the Ten of Hearts for the example) and puts it in front of the rest of the cards in the deck so that the ten of hearts is the card the spectator now sees looking at them through the glass.
The magician then states that he will let that red 10 find a red ace. Holding the glass by the stem, the magician passes a cloth napkin over the glass, quickly. When the napkin has completed it's quick pass, the red 10 has been replaced by a red ace! The magician then takes the red ace and puts it in back of the deck and passes the napkin again.
This time, the red 10 is replaced by the other red ace! Now the magician gets a black number card (say, 6 of spades) for the "Locator" and puts it in front of the red 10. A quick napkin pass, and there's a black ace!
The magician takes the ace and puts it in back of the deck. Another pass, and there's the last black ace! Now pull out the pack and put it back in the case, smiling as you take your bow. All of this magic occurs in the glass, so there's apparently no way that you could've manipulated the cards! People will fall down at your feet and worship your incredible abilities.
