 Now, remember what Anaxagoras did. He reduced the number of forces from two down to one. He reduced the number of kinds of particles from four down to two. Okay, so what do the animas do? Well, they reduced the number of kinds of particles too. Anaxagoras has the light and the dark particles. He's got those two broad different kinds. The animas have just one. All of the atoms, these particles of matter, they're indivisible, they're indestructible, but there's not different kinds of them. It's just one kind of particle. They're all the same. So they've reduced the number of kinds of particles from two down to one. They just have atoms, not all these different kinds of particles. Okay. Well then, what distinguishes one object from another? Anaxagoras is going to look at the fountain and say, look, there's two different kinds of matter there. We've got the really, really dark particles. That's the body of the fountain. And we've got the much lighter particles. That's the water coming down. I'm very different from the tree because of the combination of light and dark particles. Empedocles is going to point to the four different kinds of particles. The animas are going to say, what distinguishes those objects from me and from each other is our form. It's the structure, the arrangement, the geometric arrangement of those atoms. That's what's going to distinguish object from another. Okay, well, that's the particles. Empedocles have four kinds of particles. Anaxagoras reduce that down to two. The atom is reduced down to one. Empedocles had two forces. Anaxagoras reduced it down to one. What do the atomists do? Well, remember what they say. The reason why things change, it's random. Particles just move. They come together and fall apart in the very different geometric arrangements because they just do. So instead of having any force at all, the atomists say there are no forces. The particles just move. Interesting.