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alt title(s): Russian Doll World
That's right! This box contains OUR OWN UNIVERSE!!
Multiple worlds that exist side-by-side are fairly common in fantasy and speculative fiction, but sometimes things get more complicated than one dream 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.

The basic types:

  • The Russian Doll World - the worlds are physically inside one another. The most common way to travel between them is changing size. This dates back to the sci-fi pulps of the 1930s, even though the atomic model that likely inspired this trope (where electrons orbited the nucleus like planets around a sun) had been superseded as early as 1925.

  • The Push Pop Plot - One of the oldest examples is The Arabian Nights. Scheherazade tells stories of people who tell stories about people who tell stories, and so on.

  • The Recursive Simulacrum - Building a ship in a bottle, on a ship in a bottle, basically. Someone creates an artificial world, be it a computer simulation, virtual reality, pocket universe or a miniature planet. Then someone in that world creates another simulacrum. Bonus points if an inhabitant of the last simulacrum builds another one, or the original creator's world turns out to be a model itself.

  • The Dream Within A Dream - A character dreams of another world, is put into a Lotus Eater Machine or starts hallucinating another life, and to emphasize the drama of the situation, the character's confusion and/or the depths of their madness, the character is pushed into a layer within or thinks they have escaped into the real world, only to find they are simply in an outer layer of the dream.

For extra headache-inducing potential, a creator might mix these.

A similar phenomenon in art and graphic design is the Droste effect, where a picture includes a smaller copy of itself, that copy has a smaller copy of itself, and so on.

Compare with most Otherworld Tropes, particularly Recursive Reality, All The Myriad Ways, where the importance of all these alternates is downplayed by the assertion of a "real world", Recursive Reality, and Up The Real Rabbit Hole, where the "prime" level of existence is called into question. The latter is often paired with Recursive Reality for its headache-inducing potential.

Note that there has to be more than two layers shown or implied, or a path inward must paradoxically lead to the outer world (which is closer to an actual recursive equation.) Otherwise it likely falls under one of the simpler Otherworld Tropes. Shrinking into a subatomic world, for instance, does not count as a Recursive Reality unless a character can shrink further and find an even smaller world within, or somehow end up back where they started.

Spoileriffic trope, as the layering is usually a major plot twist.


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