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This interesting observation of Ludwik's led to no great insights.
My offering, for instance, was a skit on general relativity and
'notional forces'.
As it turns out, there is a recent effort to understand the apparently
anti-entropic clustering of small mobile objects in a suspension.
The collaboration from UPenn, UCSB, URochester NY, found that that
small polystyrene balls in water do not cluster when the balls have
constant size. If a few balls of larger diameter are added, these
latter start clustering at the edges in flat lozenges and hexagons.