Consequently, the designers installed a tuned mass damper weighing 660 metric tons (730 US tons) between the 87th and 92nd floors. When wind causes the building to sway, this suspended damping ball lags behind the movements, counteracting the sway of the building.
為此，設計者在 87 樓至 92 樓之間裝置了一組 660 公噸重的金色大球（阻尼器），當大樓受風左右擺動時，金色大球會因慣性而慢步往相同方向運動，造成阻尼器拉伸，吸收主結構的動能，減輕大樓的晃動程度。