The New York Public Library is undertaking a major reordering of the materials in its main reading room. “After 95 years as one of the city’s grandest public spaces, the reading room is letting go of the arcane, impenetrable ordering system to which it has clung for generations and replacing it with something a person might actually be able to understand… The [old] system is used only by the New York Public Library. Its greatest drawback is that no one but the system’s librarians really understands it.”