On a 20-acre site in Southern California’s Santa Ynez Valley, Frederick Fisher and Partners designed a large house open to its surroundings, taking advantage of the area’s balmy climate and stunning landscapes. The house’s plan is separated into three zones—living, working, and sleeping—but is fluid within those areas.

The master bathroom uses a disappearing sliding panel to separate the bath from the adjacent master bedroom so that, according to partner David Ross, “the two spaces blur the boundaries of each other.” The floor-to-ceiling window also blurs boundaries to the outside; it is located behind a ceiling-mounted mirror, which the firm approached “as a painting and not the traditional wall of mirrors,” says Ross.