Tall buildings can be wildly polarising. Some people see them as beacons of a modern future and glittering symbols of a city's wealth and status, while others find them dehumanising and alienating.
Yet some experts say that in a fast urbanising world - in China half the population now lives in cities - where there is rampant population growth, skyscrapers not only represent the planet's future but are also one of the more viable and sustainable visions of this future.