LONDON, ENGLAND - MARCH 04:  A skull by Jake & Dinos Chapman called 'Migraine' is shown at Sotheby's Bear Witness collection on March 4, 2015 in London, England. The collection was acquired over decades of travel by a single collector. On show, and filling up Sotheby's in it's entirety, this eclectic exhibition displays the owners fascination with bears and skulls.  (Photo by Peter Macdiarmid/Getty Images)