1. The Atomist World
Consistent Development of alternative world view from about 6th century BC to 1st century AD

2. Basic Concepts
The Universe is in a constant state of transformation (how anti-Aristotelian can you get than that!)
There is an infinite number of atoms and they are in constant movement in an infinite void.
Collisions between atoms form complex bodies.

3. Atom Dynamics
some atoms may have "hooks" and attach themselves readily to atoms that have "handles"; others are "smooth" and resist formation into larger units
The shapes fall into certain and often complementary categories, and as the atoms collide they tend to form the same basic structure again and again (e.g, "people", "trees", etc)
This makes the Cosmos a statistical outcome!  This doesn’t mean that rules don’t apply

4. More Dynamics
All such qualities as heat, color, taste and so on are derived from, and reducible to, differences in the primary properties of atoms such as shape and position.
The atoms fall in one direction and equally fast.

5. Problems with these dynamics
If the atoms all fall in one direction, how can they possibly interact/collide?
Epicurus: there must be a built-in “swerve” that occurs at random intervals (note this invokes an ad hoc device, just like the introduction of epicycles)
Implication: the visible world is a consequence of random collisions and fortuitous combination of atoms.