Some artists maintain a distinct separation between sculpture and drawing, but for Nicole Lenzi, it’s all shades of gray. Lenzi’s “drawings”—the components of “Stop and Go,” a gallery-sized installation of wood, tile and other readymade objects—are characterized by their shadows, which she carefully records in various positions with shades of gray paint. Working with the uneven floor at Flashpoint, Lenzi’s three-dimensional drawings have quirky, unexpected touches—discovering that the gallery had no baseboards, for instance, she added her own, and then echoed their forms in her drawings. If the installation looks unfinished in parts, that’s because it is—Lenzi will continue to add shadow and contour to it, following different pathways throughout the gallery space for the duration of the exhibition. STOP AND GO RUNS TUESDAY–SATURDAY, NOON TO 6 P.M., TO NOV. 15 AT FLASHPOINT, 916 G ST. NW, FREE. (202) 315-1305.