Daiana's Memorial Fountain: Hyde Park, London, October 2006

'The Hyde Park fountain, designed by US architect Kathryn Gustafson, cost £3.6m and is based on an oval stone ring. The design consists of a large Cornish granite ring with water pouring on to it, flowing in two directions at different speeds, and is supposed to sit "like a necklace" around the contours of the site'(BBC News website).