1903-1970 1905-1970 1925- 1925-2008 1957-1996 20thcentury abstractexpressionism actors actresses ad american art barnett berrice biography blackinart british colonies color correspondence exhibitions félix frank gonzález-torres greatbritain johnston joseph kosuth leigh mark monochromepainting newman nigeria northern officialsandemployees politicsandgovernment psychologicalaspects rauschenberg reinhardt robert rothko stella tim unitedstates vivien