What is an example of metaphor in the novel, We Are Not Ourselves?

The “mansion” that Eileen has idealized all her life is a metaphor for happiness. Eileen has held onto the dream of the mansion since she was a little girl. She believes that moving to the right house in the right neighborhood will fix all ills. She even wonders if moving to a new house would help Ed when he was in the first stages of his disease.