There are certain authors that simply do not lend themselves towards adaptation. The reason for this makes perfect sense: when one reads a book, they are forced by the book to envision the world that the author creates. When one is part of the visual medium of film, the world looks more like reality. Since the world looks more like reality, we are prone to question it in greater detail.
That is why successfully adapting a Vonnegut is one of the Holy Grails of film adaptation.
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