An auction of the Asian 20th Century & Contemporary Art is held by Christie's in Hong Kong, south China, May 25, 2013. The five-day Christie's 2013 spring auctions kicked off in Hong Kong on May 25. (Xinhua/Li Peng)

An auctioneer auctions a painting work by Chinese-French abstract painter Zao Wou-Ki at an auction of the Asian 20th Century & Contemporary Art held by Christie's in Hong Kong, south China, May 25, 2013. The five-day Christie's 2013 spring auctions kicked off in Hong Kong on May 25. (Xinhua/Li Peng)

An auctioneer auctions a painting work by Chinese painter Zeng Fanzhi at an auction of the Asian 20th Century & Contemporary Art held by Christie's in Hong Kong, south China, May 25, 2013. The five-day Christie's 2013 spring auctions kicked off in Hong Kong on May 25. (Xinhua/Li Peng)

An auctioneer auctions a painting work at an auction of the Asian 20th Century & Contemporary Art held by Christie's in Hong Kong, south China, May 25, 2013. The five-day Christie's 2013 spring auctions kicked off in Hong Kong on May 25. (Xinhua/Li Peng)

An auctioneer auctions a painting work by Chinese-French abstract painter Zao Wou-Ki at an auction of the Asian 20th Century & Contemporary Art held by Christie's in Hong Kong, south China, May 25, 2013. The five-day Christie's 2013 spring auction kicked off in Hong Kong on May 25. (Xinhua/Li Peng)

An auctioneer auctions a painting work by late Chinese painter Wu Guanzhong at an auction of the Asian 20th Century & Contemporary Art held by Christie's in Hong Kong, south China, May 25, 2013. The five-day Christie's 2013 spring auctions kicked off in Hong Kong on May 25. (Xinhua/Li Peng)