Spencer Tunick (born January 1, 1967) is an American artist. He is best known for his installations that feature large numbers of nude people posed in artistic formations. These installations are often situated in urban locations throughout the world, although he has also has done some "Beyond The City" woodland and beach installations and still does individuals and small groups occasionally. Tunick is the subject of three HBO documentaries, Naked States, Naked World, and Positively Naked. His models are unpaid volunteers who receive a limited edition photo as a reward.