A man looks at 'Untitled (Plum and dark Brown)' by Mark Rothko on display at Sotheby's during a preview of their Impressionist and Modern Art sale in New York, October 28, 2011. With financial markets remaining stubbornly shaky, auction houses in New York are gearing up for critical fall auctions which feature several works each poised to fetch $30 million or more. REUTERS/Brendan McDermid (UNITED STATES - Tags: BUSINESS SOCIETY)