(130418) -- SAO PAULO, April 18, 2013 (Xinhua) -- Chinese artist Cai Guoqiang poses next to one of his art pieces during the exposition Peasant da Vincis prior to a press conference in Sao Paulo, Brazil, on April 18, 2013. The exhibition that presents surreal airplanes, helicopters and submarines, will be officially inaugurated on April 20. (Xinhua/Rahel Patrasso)
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