An extreme restraint for all structural addition within the context of the world heritage – the colliery of Zollverein with all architectural qualities and inestimable historic values – is indicated.The course of the design for the new depot of the Ruhr Museum was based on serenity and mastery.Clear geometry and decreased material selection were ways and methods for the design.On the one hand, the building is positioned into the correct context, on the other hand it abstracts and sublimates this context.The new building fits into the orthogonal structure and proportion of Zollverein Xll and adopts the stringent geometry of the existing buildings, but transports the design principles into a clear minimalist form.The clear surface structure of the building, which appears monolithic, indicates the interior function.The large-scale exposed concrete and glas surfaces with their pure product quality advance the puristic and rational appearance of Zollverein.The depot for grafic and archaeology is situated on the ground floor. The depository for photographs and its laboratory form a spatial entity on the first floor.The administration of the Ruhr Museum is housed on the second and third floor.The library, as the administration’s focus, is accessible by connecting stairs by all office.