Democritus

Democritus of Abdera (c. 460–370 BCE) was a Greek philosopher from a city on the Thracian coast. With his predecessor Leucippus, he developed atomism, the theory that all things consist of indivisible particles moving in void. He wrote widely on physics, ethics, mathematics, and music, and Diogenes Laertius records more than seventy titles, though nearly all his works are lost. His surviving fragments, preserved mainly by later authors, concern the nature of perception, the conventional character of sensory qualities, and the pursuit of cheerfulness as the chief good.