http://www.youtube.com/watch?v=yWpBZzoFz_s
No sure about this item i would have to see it in the flesh.
Just going by the trailer, It doesnt look like an ordinary glass.
And most of the stuff can be done with basic sleights, and an ordinary glass.
The glass through table bit, kind of tips the probable method too.
It's not something you can make, it's taken an old, old version of the btmless tumblr which is at least 100 years old, and turned it on its head.
like i say, Id like to see one in the flesh.
As to how practical it is close up.. My guess is it will be fine in a formal setting, but table hopping, Im not sure. Presumably teh gimmick wears down after lots of use, which will render it obvious. Plus, your audience will want desperatly to handle the glass.
and i guarentee they wont be able too.
you're like Yoda.you dont say much, but what you do say is worth listening to....
Greg Wilson about.... Me.