Let me first say that I think Joel is a superb creator. This is an open review so I wont discuss methodology as that would be unfair. The effect that is in the AD copy is the reason I bought this and Joel has stated he has performed this many times with great success . I believe him , BUT essentially in order to achieve this ( as in the AD copy) the heat is on the gimmick which cannot be examined . An impression that is given in the AD copy. A second method is provided which is nice , not as strong but does eliminate the above issue. It is difficult to explain without being overt. The gimmick is of average quality but the explanation is clear and concise. A tad disappointed !!!