We can be happy underground. That’s certainly true when visiting the subterranean Green Square Library. From the street level, the skyline is reflected on glass blocks that make up the exterior of the building. Step inside, and you’ll find the library’s collection under street level. The main space is conceived as a living room, complete with a kids' corner and pint-size nooks built into the walls for children to crawl into with a book. In the middle of the collection space is a sunken garden; the perfect place to sit and read under the sun. Rising from the other end of the library is a six-level glass tower, which houses a music room, replete with a baby grand piano.