Secret: On two sides of a triangular stand is a ledge to hold four coins. Those on one side are loose, the others are glued in place. The stand is on your table with the loose coins on show. Pretend to take the first coin away but really let it fall behind the stand. Put the imaginary coin in a paper bag. Do the same with the other coins. As you cover the stand with a scarf, tip the stand backwards. Blow up the bag and burst it. Whisk the scarf away and the coins have returned.