Basically, the Meta-World seems to be a plane of existence where imaginary things are true. Who can speak on where Bern and Lambda came from, but they've been around a lot longer. Beatrice and her furniture are imaginary concepts created on Rokkenjima, but at the same time they exist in the Meta-World, and might have always been there. At the same time, the written stories and gameboards of Rokkenjima exist as alternate universes there.
The Meta-World basically seems to be a place where everything is real and nothing is fiction.
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