"Some see the glass half full, some see it half empty, and some see it crawling with toxic alien parasites who want to devour your pancreas."

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If the purpose of literature is to illuminate human nature, the purpose of fantastic literature is to do that from a wider perspective. You can say different things about what it means to be human if you can contrast that to what it means to be a robot, or an alien, or an elf.

— Jo Walton