His smile.

Not a parenthesis, no, not a traditional crescent shape, but instead a smile sponsored by Nike, in the shape of a swoosh, a checkmark made by a grade-school girl, the right side of the smile ascending over the rest of the mouth in what might be a smirk, only without the self-righteousness such a grin would imply, the audacious right side of the smile leading into a single cavernous dimple, not reflected on the other side, but alone on its half above the apex of the curve.