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In December, Casey and his husband and business partner, Nick Axelrod-Welk, who co-founded the website Into the Gloss and the brand Nécessaire, opened Contrapposto, a cosmetic dermatology clinic in West Hollywood.

All the great bottoms of art history are in contrapposto — the Farnese Hercules, hip thrust out like a soccer goalie’s; Michelangelo’s David, who cradles his slingstone beside his perked right cheek.

Third fundamental term: contrapposto, noun, Italian, a pose in which the body’s weight rests on one foot, resulting in a dynamic composition that puts the hips and shoulders at odds.

“I teach them to trust their body more, to allow their hips to go one way and their upper body to go the other way, with contrapposto,” a term from visual art that describes the distribution of weight across the body, and resulting curves.

Evenly spaced branches reached out from a trunk twisted into gentle contrapposto, its clusters of spring green foliage suggesting the outline of an isosceles triangle.