It's called The Cage Lite and it's made from industrial light bulb cages. The designer, Tracey Kessler, a San Francisco designer, won 2nd place in the 2007 International Design Awards for it. It sells in the US through Jak Home in San Fran for US $2,950 so I shall be admiring from afar!
I found this on the Apartment Therapy site, as it's one of the prizes in their Holiday Giveaway, so hopes were raised, but the competition is only open to US residents unfortunately. No chance of seeing this hanging in my home any time soon I'm sorry!
Image: Apartment Therapy