Two quotes from China Miéville, in an interview on BoingBoing:
"When I am reading books that have things I don't understand in them,
though, sometimes that mystery is completely part of the point. It's the
desideratum, you know. And that disinclination to explain can, if done
well, be part of what makes a book feel fucking great for me."
"If the reader is having to work a bit, so is the writer. All books are a
collaboration between reader and writer — and, as a reader, I don't mind
having to work if I feel it's worth it. It's exciting."