A dress made out of recycled cans in the V&A (Edit: or as Ade rather more correctly points out, the Science Museum).
The lighting effect (as is probably obvious) is a fake – it’s not spotlit from beneath, that’s my camera’s flash at work, with my fingers across it to produce the big blocks of darkness. Sadly, the little screen on my camera made it quiet hard to make out the fact that I’d still lit a bit on the left of the dress. Serves me right for not using a bit of cardboard. (Not that I had any on me, or I would have.)