The Dizzying Dimension, one of the books in the Multiverse series.
The Multiverse series is a series of books that Alex reads in "Arthur's First Day." It is about parallel universes.
The book's characters are twins, Caleb and Sam, who are kids, but geniuses, and they do an experiment that opens up a portal. One book has Caleb land in a dimension where whales have cities, and another has Sam land in Mirropolis, where every single person on the planet is a different version of himself, but at a different time in his life, and gets stuck there. Arthur states that he loves the drawings because of their detail, but finds Mirropolis scary. Later, before class, Alex brings Arthur book 1, which is titled The Dizzying Dimension and has Caleb and Sam jump through the portal together. The Multiverse series is later mentioned by Arthur when he meets Buster in the cafeteria, but he hasn't heard of it.
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