An infinite book that's just increasingly detailed tables of contents all the way through.
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I once calculated the size an index of the library of babel would need. It's exactly the size of the library.
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So just have your book be content and TOC at the same time. Like the library that is its own index if you read it correctly.
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I do indeed know a few practical solutions for that, but should I leave the meta level to expound them?

