 Philosophy has been divided into theoretical and practical since the time of Aristotle’s distinction of the sciences, and within theoretical philosophy, the enquire on nature was of major import in Ancient and Medieval times. Most of its contents later developed into modern natural science as the seeds of physics or chemistry, but its founding concepts are still worth reflecting upon. Concepts such as those of body and extension, motion and change, time and place, finiteness and infiniteness, and of nature itself have kept their philosophical gist.