Annihilation is a good book, but the hype it got is much more due to:
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the fact that it arrived at the peak of the new wave of interest for Weird lit,
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its (again, very timely) environmental spin to weird fiction,
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the fact that Vandermeer worked a lot to present himself as THE authority on Weird fiction, with his articles, collections, prefaces to reissues of older books and so forth.
Kos, or some say Kosm