Poetic naturalism allows many true vocabularies for one physical world

Carroll's central framework holds that reality is fundamentally singular and physical, but that multiple, genuinely valid ways of describing it can coexist without contradiction, each appropriate to a different level or domain. Talking about atoms and forces is one legitimate vocabulary; talking about organisms, emotions, or moral obligations is another, equally legitimate at its own level, even though the latter can in principle be reduced, layer by layer, to the former. He distinguishes this from harder-line reductive naturalism, which insists only fundamental particles truly exist and everything else is mere illusion, and from dualist views that posit separate non-physical realms for mind or meaning. The "poetic" label signals that these higher-level descriptions function like different stories about the same underlying reality — useful, accurate, and necessary, without requiring separate metaphysical ingredients beyond the physical world itself.

Takeaway: a purely physical universe doesn't require abandoning talk of meaning and value — it just requires locating them at the right level of description.