Duration is arguably the most important of the diverse materials from which Andy Goldsworthy crafts his vivid, compelling and memorable images. One of the leading exponents of Land or Environmental Art practising today, Goldsworthy tunes his works to the soil, vegetation and weather of his locations; his art is premised on the natural processes of growth, waxing and waning, ripening and decay. Some of his projects depend, for their fulfilment, on the periodic migration of animals and humans; others, on the seasonal hardening and melting of water. Evanescence, the mark of all created things, is coded into these experiments from the beginning. Goldsworthy has linked leaves in chains and allowed them to float down a creek until the currents have pulled them apart; he has filled tide-pools with dandelions that he has collected all day; he has cast a spiral garland of icicles around a tree and let the sunlight warm it away, erected a driftwood igloo at the mouth of a river and watched as it has floated out to a sea waiting to claim it. Nature is both theme and medium for his Zen-like art of appearance and dissolution; the natural objects that he deploys as objets trouves are at once themselves and symbolic of themselves.