Anaximenes was key in arriving at this conclusion. His analogies often connected parallels between man and the cosmos, insinuating that the same natural laws observable on earth applied to the heavens. Over 2000 years later, Isaac Newton proved this to be true. Throughout history, Anaximenes's observations proved helpful to uncover powerful theories, such as quantum physics and chemical properties. By the end of the Milesian philosophy era, there were many questions left unanswered; this sparked the stimulation of Pre-socratic thought to continue through many other notable philosophers such as Pythagoras, Parmenides, Heraclitus, and Democritus. Anaximenes greatest influence is not from his theories of matter, but instead it is from how he thought about these ideas. For instance, his theory of air being the underlying substance was disproved, but when looking at his idea from a fundamental aspect, in which a substance is capable of changing forms, his theory was the first of its kind. Pre-Socratic philosophy The theories of Anaximenes were likely influential upon later Presocratic philosophers, and, according to classicist John Burnet, he was in his time a more important figure than his teacher Anaximander. Similarly to Anaximenes, the Pythagoreans, according to Aristotle, believed that there was "boundless breath" which was "outside the heavens, and … was inhaled by the world". The cosmology of Anaxagoras shared many similarities with that of Anaximenes, and was likely influenced by it, while the Atomists Democritus and Leucippus adopted Anaximenes' view that the world was flat. Diogenes of Apollonia took up the view of Anaximenes' that air was the arche, that it was the governing force and the source of everything in creation, and that all substances were the result of the condensation and rarefaction of air. Plato and Aristotle Many similarities to Anaximenes' theories are apparent in Plato's theory. So much so, that some scholars have said Plato has based his theory of matter on Anaximenes's theory. In Aristotle's view on Anaximenes, he interprets the theory as the one substance being air, and all other states of matter are different condensations of air. In Plato's interpretation of Anaximenes's theory, he considers the seven states of matter: fire, air, wind, clouds, earth and stone as different densities. Acknowledging that these seven states of matter are different densities shows how the intrinsic properties of the matter have changed, and they are actually different substances. Anaximenes supports this conclusion by his explanation using the concept