Christie’s London auction house staff pose for photographs with Claude Monet’s ‘Nympheas en fleur’, which will feature in the upcoming May 7-11 New York sale of the collection of Peggy and David Rockefeller, at their premises in London, Tuesday, Feb. 20, 2018. The Monet is estimated to fetch $50 million-$70 million (35.7 million to 50 million pounds, 40.5million to 56.7 million euro). The art collection amassed by billionaire David Rockefeller could raise more than $500 million for charity when it is auctioned this spring. (AP Photo/Matt Dunham)

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