Comment by openrisk
Wonderful idea. Proof, if proof was needed that digital music (and much more in the digital domain) is still a vast unexplored universe. The equivalent physical "instrument" would be nigh impossible to build, let alone operate by a random anybody.
Nb: the sound creation seems buggy on android mobile browsers (both firefox and chrome).
The Physical Rhythm Machine Boem Boem [1] is a performance/sound installation that actually comes quite close to being a physical equivalent of this idea. Not self adjustable of course, but the sound of the balls banging around is highly visceral.
[1]: https://instrumentinventors.org/project/physical-rhythm-mach...