The architects are fond of combining unusual materials in well-tried forms of construction or vice versa. In the design of the present house, a major role was played by the client, for whom a fixed, pitched-roof structure, as required by the local authority, was too humdrum. Instead, a 16-metre, 20-tonne larch enclosure was created that can be moved along rails to connect three simple buildings. It is operated by four electric motors powered by car batteries, which are charged by photovoltaic cells on the roof. The entire mechanism is concealed in the walls of this highly insulated section of the house