You might like Left Right A Line Made by Walking Richard Long CBE 1967 England 1968 Richard Long CBE 1968 A Hundred Mile Walk Richard Long CBE 1971–2 Salt Flat Dennis Oppenheim 1968 Site Sculpture Project, Windham College Pentagon, Putney, Vermont Douglas Huebler 1968 Untitled Richard Long CBE 1967 Directed Harvest Dennis Oppenheim 1966 Reverse Processing, Cement Transplant, East River, NY, 1970 Dennis Oppenheim 1978 Ithaca Mirror Trail, Ithaca, New York Robert Smithson 1969 Parallel Stress Dennis Oppenheim 1970 Untitled (Silueta Series, Mexico) Ana Mendieta 1976 Untitled (Silueta Series, Mexico) Ana Mendieta 1974