Piece Mark Rothko (American, b. Russia, 1903-1970) "Untitled", 1949. Mark Rothko, who was central to the development of postwar abstract painting in the United States, is best known for the luminous paintings he made in the 1950s and 1960s. These classic works are characterized by their soft-edged rectangular forms and broad, thin washes of color. Rothko worked on large canvases, but he felt that the scale was intimate, establishing a close physical relationship with the viewer. These extraordinary images, including the untitled oil featured on this 1000-piece puzzle, invite contemplation and spiritual communion.