Julia Rhoads's Endplay has plenty of comic hooks. In the opening, two dancers wearing crash helmets crawl toward each other on all fours from opposite sides of the stage until, after an eternity, they collide head-on and topple over. Then the two of them stagger into an epic if accidental battle of the helmets. When they're joined by seven others, this amusing, Beckettian piece takes us on a perpetual-motion journey whose point seems to be the pointlessness of one-upmanship; Elizabeth Lentz is particularly killing as a Martha Stewart type whose tea-drinking style places her far above the hoi polloi. By contrast Shift, a new work by Rhoads and Krenly Guzman, is straight-up elegant. Unfortunately its purpose--responding to the changes in texture of Mark Messing and Benn Jordan's sometimes irritating original score--is clear within five minutes, and the rest is often beautiful but sometimes repetitive embroidery. Through 10/17: Fri-Sat 8 PM, Sun 2 PM. Vittum Theater, 1012 N. Noble, 773-862-9484. $10-$15.