In body art, the artist’s body becomes the medium. Body art overlaps with many other forms and styles, such as performance art. It became popular during the 1960s, likely as a reaction against the cold austerity of minimalism. Examples of body art include Bruce Nauman’s photograph, Self-Portrait as a Fountain (1966–1967), in which the artist’s body takes on the characteristics of a fountain as water squirts from his mouth. An example of conceptual body art is Piero Manzoni’s Living Sculpture (1961), in which the artist signed the bodies of living women.