"It was nothing but a muddy pit," landscape architect Terence Lee says about the 500-square-foot yard behind his Pacifica, California, house. Instead of filling the space with potted plants or paving it over for a quick fix, Lee devised a simple budget-friendly plan involving tilted lines and a few plants to fashion a functional, low-maintenance space fit his family of five's lifestyle.  Concrete from A Design-Minded Solution to a Narrow Landscape