A former residential building from the 1940s houses the administration of a medium-sized harness weaving mill. Since the family-owned company Rathgeber increasingly cooperates with international furniture designers, the company's products were to be exhibited and workshops held on the previously unused ground floor of the building. A prismatic, sharply cut volume of glass and steel penetrates the old building, which has been reduced to its primary form. The contrasting materiality of old and new creates a stimulating design environment. A representative spiral staircase opens up the offices on the upper floors.