- the large-scale inscriptions at the landscape scale ("Earthworks").
Like the geoglyphs of Nazca, the pioneers of Land art ((Robert Smithson, Robert Morris, Nancy Holt, Denis Oppenheim, Walter de Maria, Christo and Michael Heizer) carried out in the desert west of America "earthworks" or monumental excavations inscribed in the landscape;
- the human scale works made with materials from Nature (earth, stones, mud, branches, etc.).
The former are bound to last, even if they are eroded by the elements. The second are intended to be ephemeral, to degrade or decompose naturally.
These artistic enterprises being carried out in inaccessible places, the photographic support is essential, attesting or even constituting the work.
- The original work did not come true more in a workshopwas not more transportable ou exposable et could not hold himself because, performed in situ, far from the eyes of the public;
- the work was no longer a representation of Nature, but was part of Nature she interacted with. She was no longer fixed, definitive, evolving with climatic conditions and natural hazards;
- the work and its creator were more eternal, the work being called a day to disappear.
Land art has undergone many changes for fifty years