The Metropolitan Museum of Art 318331 portrait Kongo artist 16th–17th century (central figure); 18th–19th century (top and bottom figures) CC0 met african-global-heritage sacred-art objects-with-gravity african global heritage sacred art objects with gravity christ cross crucifixion triple crucifix Kongo artist 16th–17th century (central figure); 18th–19th century (top and bottom figures) Kongo Open-back cast brass (central figure), solid cast brass (top and bottom figures), forged iron nails, brass, copper, wood, ultramarine pigment Metal-Sculpture African Religious African & Global Heritage Sacred & Devotional Objects with Gravity