 1) To prove that “Whatever is moving must be moved by something”, Aristotle chose a body “A_B which is moving per se, and not by virtue of some part” (241b37–38). Averroes carefully distinguishes movable essentially, per se or accidentally, per accidens and movable as a whole or by virtue of some part (LC 306F; LC Schmieja 2:19–3:1). He gives us an instance of that which moves by itself but not as a whole: 