How does David Sedaris use imagery in Me Talk Pretty One Day?

Imagery:

"I'd always thought of Mister Mancini as a blowhard, a pocket playboy, but watching him dip his hamburger into a sad puddle of mayonnaise, I broadened my view and came to see him as a wee outsider, a misfit whose take-it-or-leave-it attitude had left him all alone."