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Multiple worlds that exist side-by-side are fairly common in fantasy and speculative fiction, but sometimes things get more complicated than onedream world, Another Dimension, a simple Alternate Universe, or just one Show Within a Show.
If the characters discover more layers within or without (or the layers are implied within the story), then you have a Recursive Reality.
Recursion is a phenomenon in mathematics and computer science where an equation refers to itself, allowing a finite function to represent an infinite set of objects. In physical terms, it is similar in structure to Russian Matryoshka dolls, which are designed to nest one inside the other.
(READ THE ENTIRE ARTICLE HERE) Recursive Reality – Television Tropes & Idioms
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