 In a plenum of contiguous bodies, a body will sometimes redirect the motions of a second body in way that that body resists, and in such cases the behavior of the second body is not free. In other cases the behavior of the second body is amenable to the redirection of motion, and in these cases the motions of the second body are “occasioned” and “forced” (Cavendish 1664, 443), yet the body is still moving as it  pleases.[39]  In yet other cases still, a body moves by way of motions that (of course) are internal to it, but without any outside interference or obstruction. But in such a case a body has the motions that it has in fact, and not any others. Nor will a body ever be the spontaneous source of any new motion; nor does it (ever) acquire any new motion from other bodies. It has the motions that it has, and it acts accordingly. In a plenum of bodies that are always surrounded by further bodies, no individual body will ever be entirely independent, but Cavendish is surely correct that some bodies are able to surround themselves with a buffer that weakens or neutralizes the impact of bodies further out.