Eclipse building Long Term Exhibition | Updated 5 months ago Caption: Eclipse Building Credit: WA Museum The Eclipse Building is a key attraction at the Museum of the Great Southern where long-term collections, such as the Lighthouse Exhibition, Fishing Collection the Fish Wall are displayed. The showpiece of the Eclipse Building is the Eclipse Island Optic, consisting of three glass lenses, each three metres high. The optic rotates silently on its bed of mercury and lights up the building. The Discovery Centre is located on the bottom floor of the Eclipse Building, which is all about hands-on interactive learning. Throughout the year the Discovery Centre hosts a range of interactive, engaging and hands-on programs that are always changing, and always fun! Temporary exhibitions are held on the mezzanine level. Museum of the Great Southern View the discussion thread.