What is a metaphor in the fall of the house of usher

The central metaphor is the physical house or mansion that not only stands for the Usher family but exhales the destiny of the Ushers as its very breath. In the first two paragraphs, Poe establishes the identity of the physical house with the Usher family, and this is developed throughout the story.

Expostion, rising action, climax, falling action, resolution