The 'Mall's Balls' structure is perhaps the best-known landmark in Rundle Mall. It is landmark 7 on the Rundle Mall Discovery Trail.
The 4m tall structure, known officially as 'The Spheres' by Bert Flugelman, consists of two large stainless steel spheres with a diameter of 2.15 metres, balanced one on top of the other.
Erected in 1977, they were commissioned by the Hindmarsh Building Society (subsequently absorbed into the Adelaide Bank) and donated to the City of Adelaide to mark its 1977 centenary.
'The Mall's Balls' are a common meeting place for visitors and South Australians alike.