He gained his diploma under Egon Eiermann, arguably one of the most significant postwar architects ever. As an architect, Ringel has designed and built numerous buildings, some in collaboration with Paul Schneider Esleben, as well as furniture and lamps. The Punto Nero – a door and window handle with a classic, elegant design, which employs a new technology, was designed in cooperation with TECNOLINE in 2010. “The handle points radially towards the pivot and thereby towards the concealed, square-ended shaft, which it encompasses and grips, thereby opening the door.