Democritus by Luca Giordano (c.1690).

DEMOCRITUS (Wiki)

?In reality, nothing but atoms and the void.?

 Democritus of Adbers, Greek Philosopher (460B.C.-371 B.C) 

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 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