And the one, when changed in itself, cannot possibly be any longer one.
It cannot.
And therefore cannot experience this sort of motion?
Clearly not.
Can the motion of one, then, be in place?
Perhaps.
But if one moved in place, must it not either move round and round in the same place, or from one place to another?
Certainly.
And that which moves round and round in the same place, must go round upon a centre; and that which goes round upon a centre must have other parts which move around the centre; but that which has no centre and no parts cannot possibly be carried round upon a centre?
Impossible.