Leucippus - Father of Atomism

Leucippus (fl. 450 B.C.) Greek philosopher, founder of Atomistic Theory

The sum of things is unlimited, and they all change into one another. The All includes the empty as well as the full. The worlds are formed when atoms fall into the void and are entangled with one another; and from their motion as they increase in bulk, arises the substance of the stars.*

* Summary of Leucippus' theory by Diogenes Laertius as found in The Great Thoughts compiled by George Seldes.
Image from http://en.wikipedia.org/wiki/Leucippus.