In van der Weyden's Descent from the Cross, one of these items sits in front of St. John the Evangelist. One of these objects encrusted with thousands of diamonds makes up Damien Hirst's For the Love of God. Albrecht Durer included one of these objects on a windowsill in a work depicting St. Jerome in his study. In another work, one of these objects is paired with calico roses. An anamorphic versi
In van der Weyden's Descent from the Cross, one of these items sits in front of St. John the Evangelist. One of these objects encrusted with thousands of diamonds makes up Damien Hirst's For the Love of God. Albrecht Durer included one of these objects on a windowsill in a work depicting St. Jerome in his study. In another work, one of these objects is paired with calico roses. An anamorphic version of these objects appears between two French men wearing fur coats in Hans Holbein's The Ambassadors. For 10 points, name these objects which Georgia O'Keeffe painted after they had been removed from cow heads. 
In van der Weyden's Descent from the Cross, one of these items sits in front of St. John the Evangelist.
skulls [prompt on "bones"]