It can be not only from books, but any other art (including computer games) 
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Personally i think that most dark worlds (including 1984) are not nearly as messed-up as it could have been. I am more interested in the alluded (but secret for most people) cruelty in the Lovecraftian mythos, given there our planet is pretty much an abandoned alien colony.

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Personally i think that most dark worlds (including 1984) are not nearly as messed-up as it could have been. I am more interested in the alluded (but secret for most people) cruelty in the Lovecraftian mythos, given there our planet is pretty much an abandoned alien colony.