On a very similar note, I mentioned once that a nxmxk cube could be used as
a musical instrument. For example, the nine possible movement combinations
of the 3x3x3 cube could be used as the needed musical notes to play a tune.
Of course, the same applies for any puzzle mechanism, and I am actually just
generalising an idea which is supposed to be used for my rotational gravity
puzzles sometime in the future.