WTF Sci-Fi Book Covers: The Time Dweller

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wtf,slippery,seal,cover art,books,transparent,science fiction,book cover
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Oil-seal is too slippery for even semi-transparent beings to ride.

WTF Sci-Fi Book Covers: The Saliva Tree

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book covers,books,cover art,gross,saliva,science fiction,tree,wtf
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Can't tell if the title, or the image is more disgusting.

WTF Sci-Fi Book Covers: Knot Gneiss

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wtf,xanth,pulling,book covers,cover art,piers anthony,butterfly wings,books,faries,mermaid
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"Why are you pulling to the side? Come on guys, I feel like I'm doing all the work here!"

Also, how do those butterfly wings on the mermaid hold up under water?