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Proline magic, the latest version backstage sucker vanishing glass of milk with the magician tabletop version sits on a mic stand. for the first time. You can do backstage without holding it in your hand. Something that I put together and Cliff Wigs built
The milk and cookies are pinned on. It comes with two versions, glasses.
No thick walls here. or double walls, very unique proline invention
There is a classic backstage/sucker-style milk-glass vanish in which the magician appears to show the audience exactly how the trick is done. A description of this type of routine matches your reference to a glass, tube, tray and milk. Sitting on a mini mic stand included.How the effect worksThe basic sequence is:1. The magician turns his back to the audience and says he is going to demonstrate the secret.
2. A glass apparently containing milk is placed on a small tray. On on a Mic stand 
3. A tube or cover is placed over the glass.
4. The magician appears to slide the covered glass into position.
5. From the audience’s supposedly privileged backstage viewpoint, they can actually see what appears to be the glass dropping away underneath the tray.
6. The magician then turns around and repeats the procedure from the normal front position.
7. The audience thinks, “We know exactly where the glass went.”
8. The magician removes the covering/tray arrangement—and the glass has genuinely vanished.The important idea is the sucker principle: the audience is deliberately given enough information to form what seems like an explanation, only to discover that their explanation was wrong.