Cardboard Connection. Softbound, 1977: Paul Harris has put over 250 hours into the creation of this routine. Two cards are shown -- they can even be signed.

The centers of the cards are torn out, making two "card rings." Now, the two rings are linked together! The cards are actually seen to be connected through one another.

The linked cards are then magically disconnected and immediately handed for examination. A new principle in penetrations enables you to perform this effect under any conditions without resorting to special gimmicks, gaffs, switches, or key rings.

Completely impromptu -- can be done with any deck. A 32 page manuscript with 31 illustrations.

David copperfield had even perform this trick in one of his TV special.