The 2008 tree at the Tate is by artists Bob and Roberta Smith, "made of recycled materials,including sandwich boards, tape, signs and an oil drum. Eight bicycles of various sizes have been fixed to stands around the trunk, each holding a generator that is connected to a set of light bulbs that decorate the tree. When happy children and chuckling adults hop on the bikes and pedal hard, the lights go on."
via treehugger
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