The object in the photo is a Cong, which was used in Chinese burial rituals dating back to the Neolithic period. The piece is usually, as in this case, a piece of jade hollowed out in a tube or circular pattern on the inside and a rectangular shape on the exterior. “The circle comes close to the edges of the squared enclosure. Seen from above, the view of a Cong is that of a circle-in-a-square, or a mandala.”