Clam posture

Patrick F. McManus, if you don’t know him, pens humorous tales. I’m reading The Blight Way (2006), which is a Western.

The Blight County Sheriff’s Crime Scene Investigation Unit was hunched over his computer. Byron Proctor solved more crimes with his computer than did the rest of the department put together. Tully figured that hiring the kid had raised the average IQ of the department by at least ten points. Byron had short brown hair, most of which seemed engaged in an effort to stand straight up. He wore rimless glasses half an inch thick perched on an overly large nose. He had both the posture and complexion of a clam. (p. 4)

Doesn’t that sound like half the computer wizards you know?