B of the Bang originally stood 56 metres ( 184 ft ) tall with 180 hollow tapered steel columns or spikes radiating from a central core . It was angled at 30 degrees and supported by five 25 m ( 82 ft ) long , tapered steel legs which connected to the spikes 22 m ( 72 ft ) above the ground . The sculpture weighed 165 tonnes , with the concrete in the foundations weighing over 1 @,@ 000 tonnes , including a 400 m2 ( 4 @,@ 300 sq ft ) reinforced concrete slab . The foundations are 20 m ( 66 ft ) deep .