Light defines Frank Lloyd Wright’s Beth Sholom synagogue in the Philadelphia suburb of Elkins Park. Even on a rainy day the inside of this temple seems bright. Daylight streams through its transparent ceiling, as if from the heavens, into the “house of peace” (Beth Sholom in English) . The pyramid-shaped structure, built high on a hill in the 1950s, is a National Historic Landmark, so changes to the temple pose a challenge. (Most of Wright’s original brown Naugahyde seats hav