Another artist whose best known works relate to both abstract expressionism and to color field painting is Robert Motherwell. Motherwell's style of abstract expressionism, characterized by loose opened fields of painterly surfaces accompanied by loosely drawn and measured lines and shapes, was influenced by both Joan Miró and by Henri Matisse. Motherwell's "Elegy to the Spanish Republic No. 110" (1971) is a pioneering work of both Abstract Expressionism and Color Field painting. While the "Elegy" series embodies both tendencies, his "Open Series" of the late 1960s, 1970s and 1980s places him firmly within the Color Field camp. In 1970 Motherwell said, "Throughout my life, the 20th-century painter whom I've admired the most has been Matisse", alluding to several of his own series of paintings that reflect Matisse's influence, most notably his "Open Series" that come closest to classic Color Field painting.