Read Shannon Mattern’s great essay “Marginalia: Little Libraries in the Urban Margins” (published at Places). From the essay:
These new library projects might seem to emerge from a common culture and uphold a common mission — a flurry of press coverage in late 2011 represented them as a coherent “little library” movement. But in fact they don’t. They have varied aims and politics and assumptions about what a library is and who its publics are; their collections and services differ significantly; and their forms and functions vary from one locality to another. I want to attempt here to identify a loose, and inevitably leaky, typology of “little libraries” — to figure out where they’re coming from, how they relate to existing institutions that perform similar roles, and what impact they’re having on their communities.