J.S. Bach - Crab Canon on a Möbius Strip

The enigmatic Canon 1 à 2 from J. S. Bachs Musical Offering (1747), The manuscript depicts a single musical sequence that is to be played front to back and back to front.
Video by Jos Leys (http://www.josleys.com) and Xantox ( http://strangepaths.com/en/ )
(Original YouTube description)
wiki page: http://musiccaptioning.wikispaces.com/Crab+canon+on+a+Moebius+strip

(Score book cover: Bach Musikalisches Opfer - Musical Offering - Offrande Musicale)

[1st half of the canon - harpsichord] (book opens: Johann Sebastian Bach - Canon Cancrizans - The Crab Canon)

(Straight score of the theme of the Crab Canon)

(Music stops - zoom on straight score)

[harpsichord, 1 voice: Theme, straight] (visualized by a silver ball above the score)

[Theme played backwards] (a golden ball under the score moves accordingly right to left)

[Haprsichord, 2 voices in canon] (the 2 balls move accordingly on the Moebius score)

[Harpsichord, 1 voice: First part of the theme, twice] (Theme score splits in 2 and the 2 parts move to form a Moebius strip)

[Harpsichord, 2 voices] (On the Moebius strip, 2 pins - 1 golden 1 silver - follow the 2 voices)

[Harpsichord, 2 voices] (pins invert direction)

[Canon plays on, other instruments enter] (Moebius strip changes back to straight score)

(Zoom off)

(A film by Jos Leys www.josleys.com - Images created in Povray)

(Music performed by Xantox www.strangepaths.com )

(Score book closes)