The New York Public Library has a layered material history in the city. It arose on the site of the old Croton Reservoir, a critical infrastructure for the city… When the library was established, it was built on a reservoir model. It was meant to serve as a comprehensive repository of knowledge. But there is a conceptual shift happening today moving away from libraries as catch-all repositories toward libraries as nodes in a larger network. Each institution has to figure out the unique role it can play in strengthening that network: through technical and financial contributions, community participation, and their particular collecting, preservation, and outreach strategies — the unique work they do as libraries.