The staircase winds like a screw through the entire house. The steps are covered with black marble – actually ‘Namur stone’ from Vinalmont near Liège – and strips of rubber to dampen the sound. The construction is best appreciated from the first floor. The central axis is open and the glistening chrome-plated bannisters have the effect of festive serpentines guiding the form. The incoming light is diffused beautifully by the frosted windows, in which a pattern of squares and rectangles is etched.