Concrete retaining walls form an outdoor terrace that serves as a dining area, conference room, and workshop. The three-quarter-inch construction

gravel from George L. Throop Company allows rain to percolate into 

the ground and irrigate a lemon tree rather than create polluting runoff.  Photo 11 of 11 in How Good Idea Studio Revamped a 1924 Clapboard House on a $62,000 Budget