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Sydney Opera House is a modern expressionist design, with a series of large precast concrete "shells", each composed of sections of a hemisphere of the same radius, forming the roofs of the structure, set on a monumental podium. The building covers 1.8 hectares (4.5 acres) of land and is 183 metres (605 ft) long and 120 metres (388 ft) wide at its widest point. It is supported on 588 concrete piers sunk as much as 25 metres below sea level.