As mentioned in a previous post design fictions focus around narrative and storytelling, most of the time creating an entirely different universe from our own. In fact, its extremley common in fantsy and scifi works, as we take Middle Earth from Tolkien's Hobbit, or perhaps more recently Westeros from George R.R. Martin's Game of Thrones.
With this in mind, its interesting to think how many fictional universes have been created since the begging of fiction work as a whole.
If we analyse the previously mentioned works of Phillip Pullman, we notice that the story unfolds in a universe almost completley pararel to our own, but with major diffrences that underline its almost alien qualities. The buildings and locations described are mostly the same as ones that exist, but with major architectural characteristics; machinery and mode of transport function in a mechanical manner, poewred by electricity and otherworldly forces; and in this new Earth, the existance of a kingdom ruled by sentient polar bears, the Pansebjorne.
The plot of the books themseves focus on the concept of the reality of other worlds, universes conncected by a subsance called Dust. These worlds intertwine and connect and the similarities between many of them and ours is uncanny.
We see something very similar in the 1982 film Tron, in which the protagonist, owner of an arcade, develops new technology that allows him to eneter the Grid, the progammed world of the arcade game Tron, revealing a world with its own social system, classes, justice system and with a completly different biology, of both the enviroment and the characters them sleve, no longer organic beings but lines of code that disintigrate into pixels when terminated.
Looking at these two completley different works of fiction, and their own universes, we can see how the both translate extremely well into the Multiverse Theory
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The multiverse (or meta-universe) is the hypothetical set of finite and infinite possible universes, including the universe in which we live. Together, these universes comprise everything that exists: the entirety of space, time, matter, energy, and the physical laws and constants that describe them.
The various universes within the multiverse are called "parallel universes", "other universes" or "alternate universes."
With this in mind, altough childish, the possibility of worlds like Westeros, Middle Earth and the Grid being actual existing universes is an exiting and inspiring though, that stimulates new possibilities in creating fictonal work.