Having eye contact creates you, as the presenter, as the knowledgable authority on the subject.

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In that particular excerpt from The Love Song of J. Alfred Prufrock  by T. S. Eliot, the repetition affects the tone of the poem by creating a soothing rhythmic sensation. It cannot emphasize youthfulness as the narrators in other parts of the poem point out to the passing of time and decaying of matter. It cannot create a sense of confusion and disorder because it focus on the facts individually and isolatedly. It neither can explain conventions of modern society because it relates to specificities between the narrator and his muse.