This artist's impression shows the 6m-high stainless-steel sculpture that will emerge from the Natural History Museum's west lawn this summer. Commissioned by the Museum and the Royal British Society of Sculptors, environmental artist Diane Maclean is creating the piece, composed of 11 separate vertical shafts, to reflect the Museum's research into unusual molecular structures. Mountain has a 'canyon' at the centre that visitors can wander through, while its highly reflective angular steel facets are reminiscent of the surfaces of cut gemstones and natural crystals. Peepholes will reveal highly magnified images of minerals such as aerinite and those found in a recently discovered Martian meteorite. An audio installation within the canyon space will echo through the sculpture with sounds of geological processes that occur deep within the Earth.