>> including the sweeping.
I always wonder when one of them will trample on another stone or nudge one of them as they stampede past sweeping furiously. Never seems to happen.
The physics is cool, though (bad pun)
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1
