Second, the Free Little Library by Stereotank encourages people to (quite literally) pop their head in, pick out a book or leave one behind. With small windows in and out, it remains semi-private without feeling claustrophobic in the face of its small volume.
Like the Stairway Cinema, the Free Little Library is intentionally impermanent and made of simpler easy-to-assemble (and to take apart again) materials like wood, aluminum, fabric and plastic.