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of wood, stone, or metal, that
is as ample and able to hold as much within itself
as one that is round. Nor could he make any object,
that can move about as easily or
turn in any direction it wishes, without
settling in a place different from where it
was before, except a round one. For the round object can move
anywhere without having to settle in
any place, and without having to displace itself
from the place where it started. And you
can see the manner of this by looking at a
square object put on top of a round one, compared to one put on
some other object that is not round. If you
cause both of them to turn, the angles of the
one that is not round will catch at different
places, which the round object will not do.
And you can see this quite clearly in these
three figures, in which is represented one
object that is entirely round,
whereas the other two, as you can see, are square.