Machinations By Ben Harris"The Trapdoor Card" is one of the most unforgettable, yet often overlooked, plots in card magic. Popularized by Martin Gardner and Bob Neale, this effect features a small card with a "door" cut out, just off center. Someone is invited to hold the card by this makeshift tab. The magician is then able to turn the card inside out while it is IN the spectator's hands. This an unbelievable and impossible topological illusion that you can watch over and