This is the library I want!

Walker shuns the sort of bibliomania that covets first editions for their own sake—many of the volumes that decorate the library's walls are leather-bound Franklin Press reprints. What gets him excited are things that changed the way people think, like Robert Hooke's Micrographia. Published in 1665, it was the first book to contain illustrations made possible by the microscope. He's also drawn to objects that embody a revelatory (or just plain weird) train of thought. "I get offered things that collectors don't," he says. "Nobody else would want a book on dwarfs, with pages beautifully hand-painted in silver and gold, but for me that makes perfect sense."

What excites him even more is using his treasures to make mind-expanding connections. He loves juxtapositions, like placing a 16th-century map that combines experience and guesswork—"the first one showing North and South America," he says—next to a modern map carried by astronauts to the moon. "If this can happen in 500 years, nothing is impossible."

--Stephen Levy, "Browse the Artifacts of Geek History in Jay Walker's Library"