On the floor between the titular figures is a blob of gray paint which, when tilted, is shown to be an anamorphic skull.
This painting was the only one signed in full by the artist, and in between the central characters lies a floor mosaic based on the patterns on Westminster Abbey. On a shelf sits a polyhedral sundial, and a lute with a broken string sits next to a Lutheran hymnal. On the floor between the titular figures is a blob of gray paint which, when tilted, is shown to be an anamorphic skull. FTP, name this Hans Holbein the  Younger painting which shows the two titular figures from France at the court of Henry VIII.
This painting was the only one signed in full by the artist, and in between the central characters lies a floor mosaic based on the patterns on Westminster Abbey.
The Ambassadors