Artstor is actively collaborating with a wide range of living artists and estates of modern artists. Roy Lichtenstein (1923-1997) was an American Pop artist best known for a signature style that borrows from mass culture, particularly comic books and advertising. Lichtenstein's technique, which often involved the use of stencils, sought to bring the look and feel of commercial printing processes to his painting and prints. Through the use of primary colors, thick outlines, and Benday dots, Lichtenstein endeavored to make his hand-made art look machine-made. By the mid-1960s, Lichtenstein was applying the same ethos to create Pop versions of Modern masters such as Cezanne, Picasso, and Mondrian. He also produced sculptures using various, often painted, metals. The Roy Lichtenstein Foundation and Estate has made over 1,100 images of Lichtenstein's work available in Artstor, spanning a range of periods in the artist's life and including many of his most well-known works. The Foundation and Estate are also providing associated cataloging for these images.