Andy Warhol was one of the most well-known figures of the 20th century; not only was he an American artist, print maker and cinematographer, he also advocated Pop Art, dominating the US Art Market at the time. He was known for using the silk-screen printing technique to reproduce popular and familiar images, which echoes the mechanisms of the Capitalist mode of production. Reoccurring themes in his work include celebrities and everyday objects, such as: Marilyn Monroe, Mao Zedong, Campbell Soup Cans, Coca-Cola cans, etc., bringing mass culture to the sacred white-cube art gallery space, breaking the boundary between high-brow and low-brow art. He single-handedly changed how people view art, making art widely accessible and linking it with popular culture; this revolution in aesthetics carries vast historical significance. Andy Warhol's career spans not only across art and graphic design, but a wide variety of mediums, including creation of new painting techniques, such as early imitations of Chinese “blotted line” method or the “oxidation” techniques of the 70s and 80. He further crossed over to work in movies and music, managing bands like "The Velvet Underground”. Andy Warhol’s "Factory" was founded in 1963, and in the same year, he produced the first underground movie, "Sleep" (6 hours).