The main living area of the house is in the larch-wood-clad ground floor. The “black box”—–a three-story structure made from charcoal-colored fiber-cement panels—–contains another living room. The facade absorbs warmth from the sun, preventing heat loss in winter; in warm weather, hot air escapes through the top window.  Photo 2 of 3 in Modern Efficiency and Affordability Don’t Have to Come at the Expense of Style