Exterior, Curved RoofLine, Wood Siding Material, House Building Type, and Shingles Roof Material Located in Karuizawa, a popular summer resort town in Japan’s Nagano Prefecture, Four Leaves is a weekend getaway designed to accommodate the homeowner and their guests in a lush, sylvan setting. Designed by Kentaro Ishida Architects Studio (KIAS), the highlight of the stunning, 2,400-square-foot house is its sloping, angular roof sections that are delicately assembled to resemble fallen leaves.  Best Photos from This Serene Japanese Retreat’s Overlapping Roofs Look Like Fallen Leaves