The Dusseldorf state house - for many years, first the seat of the Prussian provincial government and later the seat of the state parliament - is now known as K21 and acts as a forum for contemporary art, housing part of the North Rhine-Westphalia art collection. The architect who planned and implemented this transformation was Uwe Kiessler from Munich: he freed the original structure from the distorting conversions and annexes, and crowned it with a brave dome construction of glass and steel.