How does Laurence Sterne use imagery in The Life and Opinions of Tristram Shandy?

Imagery:

"Did not Dr. Kunastrokius, that great man, at his leisure hours, take the greatest delight imaginable in combing of asses tails, and plucking the dead hairs out with his teeth, though he had tweezers always in his pocket?"

"thou hast got an hundred enemies; and till thou hast gone on, and raised a swarm of wasps about thine ears, and art half stung to death by them, thou wilt never be convinced it is so"