Lauri Chambers is a matriarch of abstraction. She works in black, white, and tones of gray, often on small pieces of paper and modest segments of Masonite. Not every one of her works will grab you, but when one does, it will keep you there and quiet for a surprisingly long time, feeling grateful for small wonders like not knowing which stroke preceded which, and new shapes and depths that materialize the longer you look. (Francine Seders Gallery, 6701 Greenwood Ave N, 782-0355. Reception 2–4 pm, free. Through Nov 30.)