Bare Face Zig Zag Card (Bicycle)
There are several versions of the Zig Zag Card, but this one is possibly one of the cleanest and most effective.
A spectator selects a playing card from a regular deck. This card is placed in an envelope with three cut out windows which can be examined. There is absolutely nothing special about the window envelope.
The performer now makes a slicing motion, and apparently cuts the card in three parts. The center part is now moved out, like the famous Zig Zag Lady illusion. You can show this from both sides. Then the center of the card is pushed back, and the card is removed from the envelope, displayed freely on both sides, and returned to the deck.
This is a very cleverly constructed Bicycle Card, which you can show right under the audiences nose, although it cannot be examined. You can add this to a regular Bicycle Deck, and force it by your favorite method. Not a cheap item, but an extremely off-beat and effective item for the close up card worker.