Jane has been caged throughout the novel and in leaving Mr. Rochester's house she breaks free; she quite literally takes flight. In rejecting the image of a small caged bird, she is able to experience true freedom. Aspects of Jane's character parallel those of Bertha Mason, Mr. Rochester's true wife, who is physically caged and restrained in the attic. By leaving Mr. Rochester, Jane exercises a freedom that Bertha never could and shows him that she is not 'a wild, frantic bird' but a 'free human being'. Therefore, bird imagery provides the framework for Jane's journey to freedom.