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Secret worlds are a common theme in speculative fiction, particularly fantasy. They consist of a fictional universe coexisting with the real world, of which most real world inhabitants are unaware of. Examples include Narnia in The Chronicles of Narnia, the Wizarding World in Harry Potter, the Fairy World in The Fairly OddParents, Chaotic and Perim in Chaotic, among others.
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Secret world Wikipedia(Text) CC BY-SA