During the early 1900s and 1910s, Wright even designed his own variations on the Foursquare, including the Robert M. Lamp House, "A Fireproof House for $5000", and several two-story models for American System-Built Homes. Unlike other houses of the style, Wright's versions featured more open main floor plans achieved by removing or minimizing partitions between the entry, living room, and dining room. He in turn inspired other Prairie School architects, such as Walter Burley Griffin, to design similar Foursquares in the following decades.