by dat8962 » Mar 8th, '05, 22:42
Nickj is right.
Allowing the spec to become involved is far more memorable for them and their attention is more focused on what happens, rather than on you.
You'll find that the stronger effects happen where the spec shuffles the cards, cuts the deck, holds the deck, signs a card and can handle and inspect the deck or card before, during and after, simply because of their involvement.
These are all things that I look for when deciding to buy, or perform a trick.
Member of the Magic Circle & The 2009 British Isles Close-Up Magician of the Year
It's not really an optical illusion - it just looks like one!