It looks almost natural... the "leaf" is a prototype solar cell which uses organic substances rather than silicon compounds. This approach may result in cheaper, flexible solar panels, but currently they are less efficient than conventional cells. This one was unveiled at Japan's Environment Fair.
Source: http://news.bbc.co.uk/1/shared/spl/hi/pop_ups/08/sci_nat_enl_1211964605/html/1.stm
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