Anaxagoras of Clazomenae (0. 500—428 BC) postulated another element called the aether, which was in constant rotation and carried with it the celestial bodies. He also believed that there was a directing intelligence in nature that he called Nous which gives order to what otherwise would be a chaotic universe. By Nous he meant literally "the Mind of the Cosmos"… Anaxagoras was the last of the Ionian physicists.

p. 287 - Before Galileo, The Birth of Modern Science in Medieval Europe (2012)