Cannonball: Baron Munchausen voluntarily sits on the cannonball, accepting external truths or principles as self-evidently valid. He lets these truths propel him on a path, requiring no further justification.

Ducks: The ducks are a regressive chain, each duck pulling the next, and in turn the baron along ad infinitum, suggesting no ultimate grounding only an endless line of ducks.

Hair Pulling: Baron Munchausen attempts to lift himself by his own hair, representing circular reasoning.

These three images represent the Münchhausen trilemma.