At $236.4 million, a portrait by Gustav Klimt is the second most expensive painting sold at auction, while Maurizio Cattelan’s golden toilet drew $12.1 million.At $236.4 million, a portrait by Gustav Klimt is the second most expensive painting sold at auction, while Maurizio Cattelan’s golden toilet drew $12.1 million. NYT > Business [ SOBAN NEWS: International and National ]