Anyone know of any poetry that has a mirror or another reflective surface as a metaphor?

Hi. I am writing a college paper for my English cl. I need to yze a few poem's figurative language (metaphors, similes, personification, etc.). Each poem needs to revolve around the same theme, so I picked identity. Does anyone know of any poems that have mirrors or another reflective surface where the author is in search of his or her identity, or anything along those lines? I already have Sylvia Plath's "Mirror." Any advice would be greatly appreciated!