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For a region so recently shaken by a derecho , an exhibit titled “Atmospheric Front” sounds ominous. The installation at Flashpoint isn’t so scary, but it doesn’t quite live up to its potential. In their first artistic collaboration, two sisters from Northern Virginia, Hana and Shana Kim, suspend cotton twine from the gallery’s ceiling using wires attached to a series of pulleys and motion sensors, so that the weblike forms shift and morph when a visitor walks by. It’s an inspired idea, but the project’s sometimes-balky mechanics and the work’s limited degree of shape-shifting fall short of what other moving installations have accomplished at Flashpoint, notably Janell Olah’s translucent plastic ducts, which inflated when air rushed through the gallery’s HVAC system. Of the three hand-knit pieces that make up the Kims’ installation, two resemble a hammock shape, with netting that doesn’t look nearly sturdy enough to support an average-size person. A more intriguing shape is the third, which is flatter and tilted at a steeper angle, looking like it’s just unloaded a pile of invisible junk onto the ground.

“Atmospheric Front” runs noon to 6 p.m. Tuesdays through Saturdays to Aug. 18 at Flashpoint, 916 G St. NW. Free. culturaldc.org. (202) 315-1305.