Sometimes a picture - or sculpture, or other work of art - can indeed be worth a thousand words. And the arts of all kinds have long been understood to be a potential aid in the coping and healing process. The Washington Art Center and The New England Art Therapy Association have put together an exhibit of the art created by Licensed Medical Health Councilors working in the art therapy discipline. “The Art of Practice’’ is a collection of paintings, photos, and sculptures created by art therapists, whether it be art for art’s practice or art for one’s practice of therapy. Opening reception Sept. 3, 6-9 p.m.. Open to the public. Free. Washington Street Art Center, 321 Washington St., Somerville. 617-623-5315.