Backwards or forward (and back and forth simultaneously), it still sounds great.

http://www.youtube.com/watch?v=xUHQ2ybTejU

Tricky. Bach meets Mobius(or Moebius)and becomes perpetual.

Anybody know what clef this is in? My wife is a reasonably accomplished violinist and violist and she's having trouble with the notes we're hearing matching the notes on the page...

Scott

Yeah, Scott; the bouncing balls don't always seem to be consistent with the music being played at that instant.