In the fall of 1987, Philippe Haas accompanied the sculptor Richard Long to the Algerian Sahara and filmed him tracing with his feet, or constructing with desert stones, simple geometric figures (straight lines, circles, spirals). In counterpoint to the images, Richard Long explains his approach. Since 1967, Richard Long (1945, Bristol), who belongs to the land art movement, has traveled the world on foot and installed, in places often inaccessible to the public, stones, sticks and driftwood found in situ. His ephemeral works are reproduced through photography. He thus made walking an art, and land art an aspiration of modern man for solitude in nature.