"Both quantum monism and Everett’s many worlds are predictions of quantum mechanics taken seriously. What distinguishes these views is only the perspective: What looks like "many worlds" from the perspective of a local observer is indeed a single, unique universe from a global perspective (such as that of someone who would be able to look from outside onto the entire universe).
In other words: many worlds is how quantum monism looks like for an observer who has only limited information about the universe. In fact, Everett’s original motivation was to develop a quantum description of the entire universe in terms of a "universal wave function.” It is as if you look out through a muntin window: Nature looks divided into separate pieces but this is an artifact of your perspective."
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