There are several items of modern sculpture in the mall. The best-known is the 4 metre tall "The Spheres" by Bert Flugelman; two large stainless steel spheres with a diameter of 2.15 metres balanced one on top of the other. They are most commonly referred to as "the Mall's Balls" or "Rundle Mall balls". "The Mall's Balls" are a common meeting place for visitors to the mall. Erected in 1977, they were commissioned by the then Hindmarsh Building Society (subsequently absorbed into the Adelaide Bank) and donated to the City of Adelaide to mark the building society's 1977 centenary.