MBOLE, Democratic Republic of Congo. Copper alloys, patina from use. Ambi" anklet in the shape of a spherical ring, worn by both men and women. This ornament, forged by a master blacksmith from a copper ingot, was known as the "perfect form". It was used for commercial transactions and to demonstrate wealth and status, and could be used to gain access to different ranks in male 'Nkum' okunda society. 24x22.5 cm (larger). Literature: "The Perfect Form", Roberto Ballarini, 2009, p. 288 and 289