English: The Robert M. Lamp House (1903) at 22 N. Butler Street in Madison, Wisconsin, was added to the National Register of Historic Places in 1978. This unusual midblock residence was designed by Frank Lloyd Wright for his boyhood friend, "Robie" Lamp, a realtor and insurance salesman. Some elements of the design have been attributed to Walter Burley Griffin. The simple, boxy shape of the house, with its open floor plan, was very modern for the time. Wright called it "New American" in style, while the diamond-paned casement windows were "Old English" in inspiration. It marks a transition between the Chicago School and the Prairie School styles. The penthouse on the roof is a later addition, replacing an elegant roof garden complete with grape arbors and a greenhouse.