 Things change. This is a platitude but still a crucial feature of the world, and one which causes many philosophical perplexities – see for instance the entry on  Zeno’s paradoxes.  For Aristotle, motion (he would have called it ‘locomotion’) was just one kind of change, like generation, growth, decay, fabrication and so on. The atomists held on the contrary that all change was in reality the motion of atoms into new configurations, an idea that was not to begin to realize its full potential until the Seventeenth Century, particularly in the work of Descartes. (Of course, modern physics seems to show that the physical state of a system goes well beyond the geometrical configuration of bodies. Fields, while perhaps determined by the states of bodies, are not themselves configurations of bodies if interpreted literally, and in quantum mechanics bodies have ‘internal states’ such as particle spin.)