Dawn Raffel's Boundless as the Sky is a book of the invisible histories that repose beneath the cities we inhabit, and the worlds we try to build out of words. The first of its two parts, stories of real and invented cities, some ancient, some dystopian, is a response to Italo Calvino's Invisible Cities. The second part comes together into one narrative, taking place in a single city-Chicago-on a single day in 1933. It is based closely on a true...