- Gallery above highlights record-breaking art auction sales
- Factors driving up price include aggressive marketing strategies
- Sotheby's chairman weighs in on what trends to expect for 2016
(CNN)It's a warm evening back in mid-May. A few stray latecomers are just finding their seats as Christie's auctioneer Jussi Pylkkanen starts up the bidding. "Wonderful painting," he says. "One hundred million to open it."