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In the beginning they didn’t paint all that differently: Martha Schrag, Lea Grundig, Otto Dix, Rudolf Bergander, Wilhelm Rudolph and Gustav Schaffer all oriented themselves towards a more or less committed realism, but one that was close to New Objectivity. Later they went very different paths in life “between the systems”, as the subtitle of the exhibition in the Gunzenhauser Museum puts it. But the arts…