There's one major problem with making a massive skyscraper out of glass (apart from the glare issue), and that's keeping it clean. James Trosh (@troshy) was up at the viewing gallery when the windows cleaners paid a visit and made this jaunty film about it.
Video: Cleaning Windows At The Top Of The Shard
Last Updated 06 May 2013
Video: Cleaning Windows At The Top Of The Shard