The variety in Bob Eisen’s improvisational dancing is astounding. He can fold his lofty, loose-jointed frame into a tiny area on the floor so that he looks more like an embryo than a man, and he can stretch to the ceiling, as dignified and urbane as the hero in a classical ballet. He can turn gracefully across the floor and end in an awkward knot. He can make us laugh with a staggering twirl or a funny circling walk, wrists and ankles flexed. His ribs can talk to us, jutting out poignantly as he lies belly-up, pumping like a bellows or as calm as sails on a windless lake. And now more than ever, Eisen’s dancing is emotionally expressive, embellished by the groans and grimaces of mental and physical exertion. His one-man shows in the series “Knoxville” are like conversations–though Eisen does all the talking and we merely eavesdrop, wondering where each kinetic monologue will go and how it will end. Fish provides the accompaniment, “playing” a boom box by adding and subtracting sounds–industrial noise, static–and adjusting the volume. It’s all low-key yet somehow intense, as both Eisen and Fish struggle to make something of a hot room, a little noise, and a lanky body. Afterward they shift gears, playing the genial hosts and serving homemade cookies and iced tea. Saturdays at 3 (except July 24) through July 31 at Link’s Hall, 3435 N. Sheffield; $2. Call 773-281-0824 for tickets and information.

–Laura Molzahn