From street level, London can seem overpowering--a vast, crowded metropolis that crushes the human spirit--but from a viewing gallery it becomes a green city. Expansive parks, leafy squares, and lovingly cultivated back yards: a triumph of planting over building. The native love of gardening found full expression in residential squares that were planted and enclosed—in contrast to the paved civic squares of the continent. In Europe, plazas and piazzas began life as market places or as forecourts to the ruler’s palace; in London and a few provincial cities such as Bath and Edinburgh, it was a developer’s tool—a way of adding value to a new residential quarter. In The London Square: Gardens in the Midst of Town, Todd Longstaffe-Gowan, a British landscape designer, traces in scholarly (sometimes tedious) detail the evolution of the London square, from the Italianate ensemble of Covent Garden (which soon acquired a market and lost its cachet) to the flowering of the form in the Georgian era, and the steady erosion of these oases over the past century.