" To make matters worse, some of the books had actually become migratory. In the nineteenth century Brakebills had appointed a librarian with a highly Romantic imagination who had envisioned a mobile library in which books fluttered from shelf to shelf like birds, reorganizing themselves spontaneously under their own pwer in response to searches. For the first few months the effect was sadi to have been quite dramatic. A painteding the scned survived as a mural behind the circulation desk, with enormaous atlases soaring around the place like condors.
But the system turned out to be totally impractical. The wear and tear o the spines alone was too costly, and the books were horribly disobedient. The librarian had imagined he could summon a given book to perch on his hand just by shouting out its call number, but in actuality they were just too willful, and some were actively predatory. The librarian was swiftly dposed, and his successor set about domesticating the books again, but even now there were stragglers, notably in Swiss History and Architecture 300-1399, that stubbornly flapped around near the ceiling. Once in a while an entire sub—sub-category that had long been thought safely dormant would take wing with an indescribably papery susurrus. "

― Lev Grossman