So, Why Is This Art?
Walter De Maria, Vertical Earth Kilometre  (1977)

Walter De Maria, Vertical Earth Kilometre  (1977)

Robert Rauschenberg, Erased de Kooning (1953)

Robert Rauschenberg, Erased de Kooning (1953)

Bas Jan Ader, I’m too sad to tell you (1970)

Bas Jan Ader, I’m too sad to tell you (1970)

George Maciunas, Fluxkit (1964)

George Maciunas, Fluxkit (1964)

La Monte Young, Composition #7 (1960)

La Monte Young, Composition #7 (1960)

Joseph Kosuth, One and Three Photographs (1965)

Joseph Kosuth, One and Three Photographs (1965)

Keith Arnatt, Burial Piece (1969)

Keith Arnatt, Burial Piece (1969)

John Baldessari, This is Not to Be Looked At (1968)

John Baldessari, This is Not to Be Looked At (1968)

John Hilliard, Camera Recording its Own Condition (1971)

John Hilliard, Camera Recording its Own Condition (1971)

Bruce Nauman, Burning Small Fires (1969)

Bruce Nauman, Burning Small Fires (1969)