Exterior, Wood Siding Material, and House Building Type The wood-frame residence and studio are clad in vertical cedar siding—back then, a daring competitor to clapboard—instead of concrete to save costs. The effect is equally seamless, however: “If you drive by it fast enough,” Charles Gwathmey once said, “you still might mistake it for a concrete house.” Photo by Norman McGrath.  Photo 1 of 10 in 10 Modern Iconic Masterpieces from Modern Hamptons Homes