Painting by Hans Holbein in 1533
The following description is from The National Gallery:
This picture memorialises two wealthy, educated and powerful young men. On the left is Jean de Dinteville, aged 29, French ambassador to England in 1533. To the right stands his friend, Georges de Selve, aged 25, bishop of Lavaur, who acted on several occasions as ambassador to the Emperor, the Venetian Republic and the Holy See.
The picture is in a tradition showing learned men with books and instruments. The objects on the upper shelf include a celestial globe, a portable sundial and various other instruments used for understanding the heavens and measuring time. Among the objects on the lower shelf is a lute, a case of flutes, a hymn book, a book of arithmetic and a terrestrial globe.
Certain details could be interpreted as references to contemporary religious divisions. The broken lute string, for example, may signify religious discord, while the Lutheran hymn book may be a plea for Christian harmony.
In the foreground is the distorted image of a skull, a symbol of mortality. When seen from a point to the right of the picture the distortion is corrected.
Source: The National Gallery