Multiverse isn't just an ancient idea. It's the center piece of pre-modern philosophy. Bruno and Leibniz were arguing from the plenitude principle. The princ

Multiverse isn't just an ancient idea. It's the center piece of pre-modern philosophy. Bruno and Leibniz were arguing from the plenitude principle. The principle asserts "the universe contains all possible forms of existance". The idea is introduced by Plato's ontology from which everything after is arguably a derivative.[1] 1. https://en.wikipedia.org/wiki/Principle_of_plenitude https://en.wikipedia.org/wiki/Principle_of_plenitude