The blowing crystal effects has a strong impact on any type of audience. GBTP is a true and complete mentalism act; it causes such an effect that the audience will remember forever. The magician puts a glass, wineglass or fluorescent tube on a table and then he moves some meters away; He pretends he's concentrating. After a few seconds the glass blows out! The glass may be covered with a colorless bell-type cover or a plastic bag.
It's a fully mechanic system and the timer allows for a 10 to 45 seconds to go off.