Spanish architecture firm SelgasCano has designed their own office in the middle of the woods near Madrid.

A curved window made of transparent acrylic forms the north-facing wall of the tunnel-like space. The opaque, south-facing wall, offers shade to the working area from the direct sunlight.

The office is provided by a weighted pulley mechanism at one end of the tunnel that allows varying degrees of natural ventilation.

Photos by Iwan Baan