What metaphors are used in America and I by Anzia Yezierska?

Yezierska uses beautiful imagery in the form of metaphor. At the beginning of the piece, for example, Yezierska speaks of the oppressive life in Russia and how the idea of America represents "wings for my stifled spirit - sunlight burning through my darkness - freedom singing to me in my prison - deathless songs tuning prison bars into strings of a beautiful violin."