@neauoire

Can you vary the volume/intensity of the notes?

Hofstadter wrote about Bach's Endlessly Rising Canon, where the notes going up a musical scale, but they were quietest at the bottom and the top of the scale, and loudest in the centre of the scale, so you had an "always-rising" effect. :D

If you do that with a Crab Canon, you could get an "always-rising" and an "always-falling" effect at the same time. :D