The flak jacket metal scrim is actually an energy-conserving feature, developed by Mayne's firm, Morphosis. Since the outside walls of this shallow office building are floor-to-ceiling glass—to reduce the need for artificial lighting—the scrim provides shade. Openable windows allow mechanical air conditioning to be replaced by natural ventilation, taking advantage of the benign Northern California climate. (The other side of the building—the northwest—is shaded by vertical frosted-glass fins.) Furthermore, automated windows allow cool air into the building at night, turning the heavy concrete structure into a passive thermal sink. These measures have reduced energy consumption by a reported 33 percent below the already demanding requirements of California's energy code. Although there have been some complaints about overheating, on the energy front the building seems to be an undoubted success. The four bay windows, which reminded me of Marcel Breuer's Whitney Museum, correspond to the elevator lobbies; the large opening on the right is a public terrace, which the architects call a "sky garden."