DEMOCRITUS (Wiki)
“In reality, nothing but atoms and the void.”
These differences, they say, are three: shape, arrangement, and position; because they hold that what is differs only in contour, inter-contact, inclination.
Democritus of Abdera
Quoted in Aristotle, Metaphysics A 4 985b 13-16. Trans. Hugh Tredennick (1933), Vol. 1, 31