It wasn't actually David Bowie juggling the ball, it was an actual juggler who's name escapes me at the moment who basically reached around David Bowie and did the contact juggling. Amazing feat, making it look so incredibly smooth and fluid all the while not being able to see the ball.
The guy's a frickin master. I can't even do a butterfly pass anymore and that guy did it blind while hiding behind someone else's back!
I just looked it up, the juggler's name is Michael Moschen
. Truly a God among men.
I found a TED video
of him. Very interesting.