> English-language literature that is difficult to translate into other languages?

A few examples come to mind:

Ulysses by James Joyce

Alice in Wonderland by Lewis Carroll

Naked Lunch by William Burroughs

The stream-of-consciousness style of flowing sentences, how the author plays with language, exotic or made-up words, sounds, subconscious associations - all contribute to a very challenging translation, I imagine.

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Edit: Oh, I'm a couple days late in replying, and others have mentioned similar works of literature.