Where does one put the massive tomes of knowledge with which the brain, a metaphorical elastic sponge, soaks up and expands to accomodate more knowledge? I dunno, how about a malleable rubber bookshelf? [Behance via Bookshelf via Boing Boing]
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These would be vastly more interesting if installed with the shelves oriented vertically instead of horizontally.
Edit: Forgetting, for a moment, the typical 16" between studs, of course.