>Also, these -- at least the ones i've seen -- have at least a
>symmetrical (over a single line, though not a point as with the
>completely round disks) weight distribution.  It's not like they're
>completely unbalanced, or something.

actually, i think the big thing is that they be "rotationally"
symmetric, not "reflectively" symmetric.  like a fan blade...not like
a bird.

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