constantly opposed forces. Second, a related point: just like Anaximander’s apeiron, Anaximenes’ air is that from which other things are separated out. The nice thing about air, at least on his theory, is that you can either thin it out and make fire, or thicken it and make cold things like water and earth. It is an in-between kind of stuff, and so can be the principle for both hot and cold things. Third, there’s the fact that air is invisible, unlike fire, clouds, seas, and rocks. So if there is some infinite, unbounded substance surrounding us in all directions, it must be air. Otherwise we
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