Falling Blocks (exp13blackandwhiteshapes (4))
Check it out here:
... or here is a different earlier experiment:
I would suggest listening to it with something electronic like this itun.es/ca/2WnWq?i=281074746 by Autechre song Foil.
Here is a youtube video of a version of this animation logic using a physics engine (i.e. matter-js) with some experimental abstract sounds involving delay/echo and noise...
And here is the live running code: