Influenced by the architectural photography of the Bauhaus Ruff began his Houses series. He photographed unspectacular buildings in and around Dusseldorf – choosing those constructed between the 1950s and the 1970s. He took these images early in the year, when skies were often cloudy and grey, and he worked early in the morning when buildings showed little signs of human presence. Even so, he altered some of the images by removing a tree, a traffic sign and closing an attic window. By doing so the focus is on the utilitarian architecture, forcing the viewer to consider the building itself very closely.