“Like nuclear power plants and sensitive computer networks, the safest rare book collections are protected by what is known as ‘defense in depth’ — a series of small, overlapping measures designed to thwart a thief who might be able to overcome a single deterrent. The Oliver Room, home to the Carnegie Library of Pittsburgh’s rare books and archives, was something close to the platonic ideal of this concept. Greg Priore, manager of the room starting in 1992, designed it that way.” So the only thief who could get past the Oliver Room’s defenses was Priore himself. – Smithsonian Magazine