Ma Yansong: Urban architecture inspired by mountains, clouds and volcanoes

Taking inspiration from nature, architect Ma Yansong designs breathtaking buildings that break free from the boxy symmetry of so many modern cities. His exuberant and graceful work -- from a pair of curvy skyscrapers that 'dance' with each other to an opera house that looks like a snow-capped mountain -- shows us the beauty of architecture that defies norms.