I’m not sure if my comment to Rich’s post got spam filtered or not so I’ll repost it here.
That guy is VERY smooth! Quite the inspiration too. The first time you, I or anyone saw contact juggling was in the movie Labyrinth with David Bowie. David Bowie had his hands behind his back and Michael Moschen, a juggler and choreographer, who created contact juggling, did the manipulations while wearing leather gloves. The only special effect used was when the balls floated away.
Michael Moschen taught an apprentice his techniques and that apprentice published the lessons in a famous book titled “Contact Juggling” that just has a black cover and plastic binding like it was made at Kinkos. As the story goes, Moschen was ticked!
The “crystal” balls (acrylic) are actually manufactured for the chemical industry and are used to float on top of vats of chemicals. They are fun to play with! I toy with contact juggling but have not put in the hours that this guy has obviously done in training.