Francisco de ZurburÃ¡n painted several depictions of Saint Francis holding one of these objects while meditating.
Francisco de ZurburÃ¡n painted several depictions of Saint Francis holding one of these objects while meditating. A painting dedicated to "all great conquerors, past, present, and future" depicting a massive number of these objects on top of each other was painted by Vasily Vereshchagin. One of these objects rests on a book across from a boy resting his elbow on another book in a still life by Paul (*) CÃ©zanne, who also created a still life vanitas painting depicting four of these objects stacked on top of each other. Damien Hirst studded one of these with diamonds, and a very large anamorphic one is in the bottom-center of The Ambassadors. For 10 points, name these objects often used in paintings to show the fragile mortality of life. 
Francisco de ZurburÃ¡n painted several depictions of Saint Francis holding one of these objects while meditating.
skulls [prompt on "heads" or "bones"] 