The Aristotelian universe consisted of the world in the center (composed of the four elements air, earth, fire, and water), the celestial spheres above (composed of the fifth element ether), and the spherical firmament of the fixed stars surrounding all.
People actually believed this was how the universe worked. It supplanted earlier models in which the world was flat, the heavens or “firmament” was a literal dome which separated the world from the “waters” of primordial chaos, and the underworld was another dome under the flat Earth which complemented the heavens. (A model I mentioned in past posts. It roughly informs the omniverse and world axis cosmologies.)
This model influenced some retroclone writers. The Pathfinder cosmology (specifically the Golarion campaign setting) based the organization its elemental planes on Aristotle’s. The Blood & Treasure cosmology (specifically the Nod campaign setting) adopts Aristotle’s cosmology wholesale, and combines it with that of Dante’s Inferno too. As I mentioned in a previous post, Nod’s cosmology goes even further and makes each of the planets an outer plane. ADDEDUM 11/21/2019: The Voidspanners setting also uses a variation of the Aristotelian celestial spheres. Unlike Nod, these are mundane planets and not outer planes as planets.
Why is this remotely relevant? It occurred to me that I was going about campaign cosmology all wrong. This should be common sense! There is no reason why the multiverse cannot contain multiple universes with different cosmologies. A flat world, celestial spheres, solar systems, etc.
In future posts I should like to describe a multiverse consisting of multiple universes with different cosmologies.
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