TO PRODUCE A CARD WITHOUT SEEING THE PACK.
Take a pack of cards with the corners at one end slightly cut off. Place them all one way, and ask a person to draw a card; when he has done so, while he is looking at it, reverse the pack, so that when he returns the card to the pack the corner of it will project from the rest; let him shuffle them; he will never observe the projecting card. Hold them behind your back. You can feel the projecting card; draw it out, and show it.