The house is located on the shores of a Swedish lake in a nature reserve. The only new buildings allowed in this area are extensions to existing structures. In the present scheme, an unconventional method of construction was used, in the form of a room that can be extended telescopically out of its basic “cocoon” in summer in little more than 20 seconds. Templates were supplied by the architects for the prefabrication of the curved load-bearing plywood structure. After a period of weathering, the red-cedar shingle cladding acquires the colour of the grey granite rock of the surroundings. The few glazed areas in the facade were located so as to avoid reflections that would be visible from the lake.