There is a round white building at Australia Square. Australia Square is on the main street, George St, in the city and more or less half way between Circular Quay and the busy shopping district at Pitt St Mall. I am not sure if the building itself has a proper name. This building has always been known as Australia Square. On the 47th floor of the building is a revolving restaurant known as O Bar. You can go there for drinks. We went there for dinner.