Edited sentence: A  tall stainless steel tree, a sculpture by Dartmouth artist Dawn MacNutt, was installed in the main foyer in early 2008.An effort is being made to achieve Leadership in Energy and Environmental Design (LEED) Silver certification.Entitled Together We Stand, it is suspended in the 3-storey atrium at the axis of the building and is made of steel wiring with leaves of aluminized polyester woven in Switzerland.Examples of LEED elements in the project include the field sod roof of the cafeteria, collected rainwater used for flushing toilets, extensive use of construction materials with recycled content, use of Low-E glazing and a reflective white ThermoPlastic Olefin roof membrane.The piece was originally located in the lobby of the Infirmary building at the nearby Queen Elizabeth II Health Sciences Centre until renovations there necessitated its donation to the school.This "green building" rating system emphasizes sensible land-use, energy efficiency, and comfort.Works of similar construction by the same artist can be found at Alderney Landing