Jackson Pollock. Autumn Rhythm (Number 30). 1950. Metropolitan Museum of Art, New York City. (Photo in Public Domain)Yves Klein. ANT 76, Grande anthropophagie bleue, Hommage à Tennessee Williams. 1960. Centre Pompidou, Paris. (Photo by JW Bailly CC BY 4.0)Andy Warhol. Ten Lizes. 1963. Centre Pompidou, Paris. (CC BY 2.0 via Oh Paris on Flickr)Robert Smithson. Spiral Jetty. 1969-1970. Great Salt Lake, Utah. (CC-BY 2.0 via Retis on Flickr)Chris Burden. Shoot. 1971. (Photo in Public Domain via boingboing.net)Jospeh Beuys. I like America and America Likes Me. 1974. (Photo in Public Domain via Rui Valdivia)Maya Ying Lin. Vietnam Veterans Memorial. 1981-1983. The Mall, Washington D.C. U.S. Veterans point out a familiar name at the Vietnam War memorial following a Veteran’s Day ceremony, Nov. 11, 2006. Defense Dept. (Photo by Cherie A. Thurlby from Wikimedia)Jean-Michel Basquiat. Untitled. 1981. The Broad Art Foundation, Santa Monica. (Public Domain)Ai Weiwei. Kui Hua Zi (Sunflower Seeds). 2010. Tate Modern, London. (CC-BY-SA 2.0 via Loz Pycock on Flickr)Marina Abramović. The Artist is Present. 2010. MOMA, New York City. (CC-BY-SA 3.0 via Shelby Lessing Wikimedia)