Normally you'd never notice it, but all tall buildings sway a little in the wind. Scarcity of land is forcing us to build skyscrapers taller and build them on smaller and smaller bases.

Taiwan's tallest skyscraper, Taipei 101 ... designed to absorb shock and reduce building sway. Weighing 660 metric tonnes, the spherical damper is constructed from 41 steel layers and swings ...