Perforated Disc (pi), 3000-2000 BC, Cleveland Museum of Art: Chinese ArtSize: Diameter: 23.5 cm (9 &
Perforated Disc (pi), 3000-2000 BC, Cleveland Museum of Art: Chinese ArtSize: Diameter: 23.5 cm (9 ¼ in.); Inner diameter: 7 cm (2 ¾ in.)Medium: jadehttps://clevelandart.org/art/1915.627 -- source link
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