This is my best trick! I invented it in 1984 and has sold many, many hundreds over the years, it is always a hit at magic conventions. I have liking for doing "ungimmicked versions" of...

In this book Gay Ljungberg shares his performing experience with the reader and reveals a treasure of valuable secrets about the psychology and the techniques he uses.

This is a classic mental effect where three spectators each write down a number and a fourth spectator makes the addition. this sum matches your prediction. So far so good.