Light and atmosphere are the central issue for human well being. The conversion of a physiotherapy practice on the ground floor of a 1950's office building in Cologne, placed high demands on the architect. The existing two sides of glass facade should get as much natural light into the interior space with a maximum of functional space. The free, flowing space configuration places a large share of natural light into the depths of the space. The patient treatment areas are arranged as cubes and are a free-standing ensemble positioned in the flowing space, between facade and facade. The physical therapy practice also includes a large gym and a shiftable sport space. This flexible space solution allows a large number of different therapies at the same time.

The changing of closed and opaque surfaces creates spectacular light situations. The roof elements of the Cubes allow a mix of natural and artificial light with a controllable range of medical and atmospheric lighting. Additionally, they create a natural and efficient ventilation system in a very unconventional way. The new rooms of the physiotherapy practice, a whole ensemble of light and space sculptures are united by bright spaces without affecting the functionality of the therapy processes.