  Leibniz, of course, recognized that the laws of motion sketched in  the TMA are radically at odds with the testimony of everyday  experience. After all, it would seem to be the case that if the world were governed by the laws of the TMA, it should be no more difficult  to move a planet than a   pebble.[6]  Leibniz sought to close this gap between the fundamental laws and  experience with the publication of his Hypothesis physica  nova (HPN) also known as the Theoria motus concreti,  which he also dedicated in 1671, this time to the Royal Society of  London (A.VI.ii.221–257). In the HPN, Leibniz argues that the laws of the TMA yield the Huygens-Wren laws of impact when taken together  with the contingent structure of the actual world. Central to  Leibniz’s strategy is the idea that all bodies in the actual world  are elastic due to a pervasive aether, and are composed of discrete  particles. Although mass continues to play no foundational role in  his applied system of physics, Leibniz is cleverly able to argue that larger bodies will generally be more resistant to motion due to the  larger number of particles from which they are constituted. A pebble  striking a planet will thus fail to have any significant effect  because the pebble’s velocity is propagated to the planet not at a  single blow but particle by particle. Its motion is consequently  diluted – and even reversed – as it is repeatedly summed  with the velocity of each subsequent particle.