What is 4 Switch?
A method: Pierre Acourt has “revisited” a little-known and yet ingenious method that uses the permutation of 3 objects (or 3 people). This process is totally different from Bob Hummer’s famous principle based on permutations and updated with the Green Neck system.
The advantage of 4 Switch is that the magician does not need to know the order of the objects before turning around.