"Untitled" by Mark Rothko, on display before auction at Sotheby's, New York, in May. Does its value stem from its pedigree? Or is it valuable because of its contribution to the ongoing dialog that is human expression through the ages? Emmanuel Dunand/AFP/Getty Images hide caption

itoggle caption Emmanuel Dunand/AFP/Getty Images

Museum director Alex Rueger (L) and Dutch artist Jeroen Krabbe stand in front of Vincent van Gogh's long-lost Sunset at Montmajour at the Van Gogh Museum in Amsterdam. The 1888 landscape painting from the height of the Dutch master's career had been abandoned for years in a Norwegian attic on the belief that it was a forgery. Lex van Lieshout/AFP/Getty Images hide caption

itoggle caption Lex van Lieshout/AFP/Getty Images