Fictional plants can germinate in minds, so books about them are special, more akin to seedbanks than books. Other books provide the soil.
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Don't place seed books in your library without adequate quarantine. Or do you want the plants to spread and Asimov's robots to become mossy?
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I left my copy of Ficciones unattended near one once. Babel's library has been overgrown by a jungle and its inhabitants are now farmers.