What figure of speech is at the center of emily dickinson’s “’hope’ is the thing with feathers”?

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While looking at ads on a professional job site, justin saw this job posting: "the employee should have a degree in human behavior and at least 5 years experience in behavioral modifications. we are also looking for an employee who is good at crisis divergence. typically employees will spend a lot of time supporting others."

Which section of the passage illustrates mrs. dalloway's feelings of emptiness caused by her social identity