A house organized as a spiralling sequence of 4 large rooms in 4 levels. These big spaces without a fixed hierarchy let this house invite the inhabitants to organise their lives following their own preferences. The building envelope was defined by the full width, the maximum area and height fitting into the building regulations. As a result of the existing topography spatial variations were developed; starting with the 4m ceiling height of the entrance level, the vertical passage up to the horizontally extended spaces opening up towards the surrounding greenery. The upper large room links to the roof terrace - the biggest social area in the house. Construction is in situ cast concrete. Façades are rendered in plaster coloured dark greyish blue. Protruding window boxes made of oak add a 3D quality to the façade, thus enhancing the depth and massive character of the interior. All glass panes are fixed, with wooden side vents and doors.