Hamill Gallery of African Art is located a few blocks west of Mass Avenue on the edge of Roxbury. The gallery shows ever-changing displays from 75 major peoples, giving a balanced view of subjects, styles and techniques used for centuries in west and central Africa. Works include masks, figures, artifacts, textiles, jewelry, books and posters giving an idea of the visual impact and spiritual power of tribal art. Most of the work is carved of wood; many include additions of cloth, raffia, metal, feathers, leather, nails, pigment, oil, beads or sacrificial offerings. Every three months special exhibitions highlight one tribe or theme.