When three young painters,the Germans August Macke and Franz Marc and Frenchman Robert Delaunay first met,all was well with the world. They could have no idea that the expressionist fragmentation of images that so fascinated them would become a symbol of the impending disaster of the First World War,in which both Marc and Macke were killed. The Sprengel Museum has dedicated a major exhibition to the short but intensive phase before the war,in which these three men inspired each other.