This is an idea that just randomly came to me recently. It's a universe (either infinite and unbounded or finite and looping) that's completely filled with water, and there are little worlds inside the air bubbles that are floating around.
Visible in this picture: Two bubbles merging together (that's gonna wreak havoc on their ecosystems!), a pure and pristine natural world (the brown and green one), and a polluted industrial world (the one you probably think looks like a Poke Ball).
Am still working out how gravity and everything works in this universe.
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