Charm of seeing marvels while traveling.

The scene represents a perceived marvel or unusual sight encountered during historical travels, and this is a charm so that you too shall see such things while traveling.

From the 15th-century French manuscript known as the Livre des merveilles (Book of Marvels). It illustrates a man with an enlarged scrotum, as observed by a traveler who documented it in the text.
It is part of an anthology of travel literature and texts focusing on the Orient.
The scene represents a perceived marvel or unusual sight encountered during historical travels, and this is a charm so that you too shall see such things while traveling.