Ontologies

Stoics: there is only the fiery Logos and its providence
Epicureans: there is only the atoms and the void
Aristotle: there is exactly five elements and earth is at the center of all the elements
Plato: there is only abstract entities and matter is an illusion
Skeptics: it is impossible to know what is
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Diogenes the Cynic: there is only this barrel. It’s a really nice urn, it keeps me sheltered at night. It’s made of the finest ceramic.