The state of the elements.
I am sure others have thought of this, but consider the four classical elements: Earth, Water, Air, and Fire. I do think that the ancients had an idea of what was going on, and in a way to classify all of matter, they did it in a way that they could grasp and convey the information using the language and technology of the time. I consider the classical elements more of a representation of all states of matter, which they did a good job of. Earth = Solid, Water = Liquid, Air = Gas, Fire = Plasma. (Although some might consider Aether = Plasma.) It would take until the modern era before they could truly explain the behaviour of matter with chemistry.
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