http://www.economist.com/culture/displaystory.cfm?story_id=16056403.

“THREE months after the world’s most expensive work of art was sold at auction in London the record has been broken again. This time by the sale, at Christie’s in New York, of a painting by Pablo Picasso that had not been seen in public for more than 50 years and had only ever been photographed in black-and-white.”