Awesome street art (Thanks, Teresa! :)

"Dies Irae" by Kurt Wenner

Kurt Wenner born in Ann Arbor, Michigan is an artist best known for his realistic street painting and chalk murals using a projection called anamorphosis. (Wikipedia)

A famous work with anamorphosis is Holbein's "The Ambassadors" (1533). Can you guess what that thing is at the bottom-center of the painting?