Ghosts is the epitome of a tragedy, for the reason that it encompasses the very ideals of one. In Aristotle's Poetics he defines tragedy as
"an imitation not only of a complete action, but also of incidents arousing pity and fear. Such incidents have the very greatest effect on the mind when they occur unexpectedly and at the same time in consequence of one another; there is more of the marvelous in them than if they happened themselves or by mere chance." (Chapter 9)
Ibsen embraced these standards through the development of his characters when he wrote Ghosts. Mrs. Alving and