AIA architect David Hertz, known for 747 Wing House, looked to the structure of a butterfly wing when designing this Venice home. The inverted roof of Silver Triangle House (or Butterfly House) captures water that collects in a sump and is used for subsurface irrigation. The roof is just one of the home's sustainable features, which, Hertz says, "are not compromises to the design; they're part of the design." Photo by Laura Doss.  outdoors from Dwell on Design West Side Home Tour