Final answer:
The Caldecott Medal features an engraving of characters from Randolph Caldecott's illustrations, while the Newbery Medal has an image inspired by author John Newbery.
Step-by-step explanation:
On the back of both the Caldecott and Newbery Medals, there is an engraving that features figures from children's literature. Specifically, the Caldecott Medal has an image of characters from Randolph Caldecott's illustrations - a man on a horse and a boy. The Newbery Medal displays an image of a man, presumed to be a storyteller, riding on a horse and talking to a boy seated on the back of the horse – inspired by the eighteenth-century author John Newbery.