Having seen Pollock's 1951 paintings of thinned black oil paint stained into raw canvas, Helen Frankenthaler began to produce "stain paintings" in varied oil colors on raw canvas in 1952. Her most famous painting from that period is "Mountains and Sea" (as seen below). She is one of the originators of the Color Field movement that emerged in the late 1950s. Frankenthaler also studied with Hans Hofmann. Hofmann's paintings are a symphony of color as seen in "The Gate", 1959–1960. Hofmann was renowned not only as an artist but also as a teacher of art, both in his native Germany and later in the U.S. Hofmann, who came to the United States from Germany in the early 1930s, brought with him the legacy of Modernism. Hofmann was a young artist working in Paris who painted there before World War I. Hofmann worked in Paris with Robert Delaunay, and he knew firsthand the innovative work of both Pablo Picasso and Henri Matisse. Matisse's work had an enormous influence on him, and on his understanding of the expressive language of color and the potentiality of abstraction. Hofmann was one of the first theorists of color field painting, and his theories were influential to artists and to critics, particularly to Clement Greenberg, as well as to others during the 1930s and 1940s. In 1953 Morris Louis and Kenneth Noland were both profoundly influenced by Frankenthaler's stain paintings after visiting her studio in New York City. Returning to Washington, DC., they began to produce the major works that created the color field movement in the late 1950s.