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It was designed by the startlingly under-appreciated Thomas Heatherwick, who currently has a retrospective at the V&A in London. I say "under-appreciated" because I believe that he has not achieved the popularity of many of the other designers who set themselves to a similar range of projects. Consider, for example, Philippe Starck, who is a household name. Heatherwick is, in my opinion, a far more interesting designer and yet one who seems to still be appreciated mainly by the cognoscenti.
If you want to see it in action, BBC coverage is here.