A trilogy is a set of three works of art, usually literature, film, or video games that are connected and can be seen as a single work, as well as three individual ones. Most trilogies are works of fiction involving the same characters or setting, such as The Deptford Trilogy of novels by Robertson Davies or The Godfather films of Francis Ford Coppola. Others are connected only by theme: for example, each film of Krzysztof Kie?lowski's Three Colors trilogy explores one of the political ideals of the French Republic (liberty, equality, fraternity) and each novel in Paul Auster's The New York Trilogy uses formats from detective fiction to explore existential questions. Trilogies can also be connected in less obvious ways, such as "The Nova Trilogy" of novels by William S. Burroughs, each written using Brion Gysin?s cut-up technique. Trilogies — and series in general — are common in science fiction and

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