Climate conductor ... Harmonic Fields, by Pierre Sauvageot. Photograph: Vincent Lucas. Sauvageot describes his creation as "a symphonic march for 1,000 aeolian instruments and moving audience". It is not only a striking piece of land art, but a carefully constructed piece of music, with an integral balance of theme and structure. "It's important that it is not just a circuit of weird noises," Sauvageot says. "The experience develops through individual movements."