A visitor is seen inspecting a Chinese ancient art work at a preview show of an auction house in Beijing, in May. Until recently, few in the art world had even heard of China's auction houses. Today, ... more 

A visitor is seen inspecting a Chinese ancient art work at a preview show of an auction house in Beijing, in May. Until recently, few in the art world had even heard of China's auction houses. Today, they are among the world's biggest by revenue, posing a serious challenge to the likes of Sotheby's and Christie's less