The eyes that fix you in a formulated phrase,
And when I am formulated, sprawling on a pin,
Unlike The Fresh Prince of Bel Air, Prufrock has grown tired of his pick-up lines.
The image in the second line is of an insect “pinned” to a backing as was done by old-school natural scientists:
“Formulated” may suggest formalin, which is a preservative often used in preserving insect and animal specimens used for study. The “eyes” are the people looking at Prufrock, viewing him as one would view a particularly interesting species of strange insect—in this case, a live specimen, “wriggling” on the pin. There’s a sadism here which…yeah, I’ve been to some of THOSE parties, lemme tell ya.
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