By Rani Singh, contributor of Forbes Christie’s 250th anniversary is being celebrated with a series of special sales. The auction house is active across the world and has been making inroads in Asia for several years now. At the launch of its summer season, I spoke to Christie’s Global President, Jussi Pylkkänen, and its UK Chairman, Orlando Rock, about what they were discovering about Asian art market behaviour. Ken Yeh, deputy chairman of Christie’s Asia gestures in front o