Photo Gallery: Chinese Artist Operated on in Munich 09/16/2009
 Ai Weiwei -- pictured here at Kassel's Dokumenta exhibition in 2007 -- is...
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Ai Weiwei -- pictured here at Kassel's Dokumenta exhibition in 2007 -- is considered one of China's most important artists, but after repeatedly accusing the government of human rights violations, he has also become one of the country's most controversial.