The Metropolitan Museum of Art 317830 portrait 18th century CC0 met african-global-heritage symbols-patterns design-assets objects-with-gravity african global heritage symbols patterns design assets objects with gravity celtic cross brooch bronze knotwork geometric metalwork medieval irish ancient ornament jewelry dark brown texture pattern symbol religious artifact historical hand mäsqäl 18th century Amhara or Tigrinya peoples Wood Wood-Sculpture Religious African & Global Heritage Symbols & Ornament The Maker’s Cabinet Objects with Gravity