From Chapter IV., Parmenides of Elea
To sum up. What is, is a finite, spherical, motionless corporeal plenum, and there is nothing beyond
it. The appearances of multiplicity and motion, empty space and time, are illusions. We see from this
that the primary substance of which the early cosmologists were in search has now become a sort of
"thing in itself." It never quite lost this character again. What appears later as the elements of
Empedokles, the so-called "homoeomeries" of Anaxagoras and the atoms of Leukippos and
Demokritos, is just the Parmenidean "being." Parmenides is not, as some have said, the "father of
idealism"; on the contrary, all materialism depends on his view of reality.