I recently got back from a week performing in Smashed a show from Gandini Juggling. Yesterday there was a nice 2 page interview with Sean Gandini in the London Evening Standard. You can read it here:
Going for the juggler – Gandini Juggling | Theatre.
CircusGeeks.co.uk 
The article speaks of a bulletproof glass box behind the house of the gandinis.. does anybody have a picture of that?
Better than that I can link you a video…. http://www.youtube.com/watch?v=qw5a3rAr5BI
Of course, I should have known…
I was thinking of something bigger, to pass clubs and balls as a real training space. This thing is cool too, but yes I knew about it 😉