Patricia Johanson <em>Stephen Long</em>, 1968 © Patricia Johanson Keith Arnatt <em>Liverpool Beach Burial</em>, 1968 Michael Snow <em>La région centrale</em>, 1971 © Michael Snow Carlos Ginzburg <em>Tierra (Land)</em>, July 1971 Group “i” <em>E. Jari</em>, 1966 Jan Dibbets <em>Crossing the Path</em>, 1969 Helen Mayer Harrison and Newton Harrison <em>Survival Piece #1</em>, 1970–71 Kristjan Gudmundsson <em>Painting of the specific gravity of the planet Earth</em>, 1972-73 Richard Long 1970 © 2012 Artists Rights Society Les Levine <em>Systems Burn-off × Residual Software</em>, 1969 / 2012