One of the examples of contrapasso occurs in the fourth Bolgia of the eighth circle of Hell, where the sorcerers, astrologers, and false prophets have their heads turned back on their bodies such that it is "necessary to walk backward because they could not see ahead of them."
In the fourth Bolgia of the eighth circle of Hell, sorcerers, astrologers, and false prophets are punished by having their heads turned backward. This punishment forces them to walk backward as they cannot see in front of them.