Richard Long's land art is created by walking. When he's not walking, he works with the indigenous materials he's collected while walking around the world. His works are ubiquitous in Europe this summer.
Long at Hamburger Bahnhof, Berlin 2011:
Long at Haunch of Venison, London 2011:
Also at Hallen für Neue Kunst, Schaffhausen, where no photography was allowed.