" It seems simple to define what a library is—namely, it is a storeroom of books. But the more time I spent at Central, the more I realized that a library is an intricate machine, a contraption of whirring gears. There were days when I came to the library and planted myself near the center of the main corridor and simply watched the whirl and throb of the place. Sometimes people ambled by, with no apparent destination. Some people marched crisply, full of purpose. Many were alone, some were in pairs; occasionally they traveled in a gaggle. People think that libraries are quiet, but they really aren't. They rumble with voices and footsteps and a whole orchestral range of book-related noises—the snap of covers clapping shut; the breathy whisk of pages fanning open; the distinctive thunk of one book being stacked on another; the grumble of book carts in the corridors. "

― Susan Orlean , The Library Book