In the ancient Greek philosophy, arche (ἀρχή)'s the beginning or the first principle of the world. The idea of an arche was first philosophized by Thales of Miletus, who claimed that the first principle of all things's water. His theory was supported by the observation of moisture throughout the world and coincided with his theory that the earth floated on water. Thales' theory was refuted by his successor and esteemed pupil, Anaximander. Anaximander noted that water couldn… (More on Arche)