Perforated Disc (Pi), 3000-2000 BC, Cleveland Museum of Art: Chinese ArtSize: Diameter: 21.2 cm (8 3
Perforated Disc (Pi), 3000-2000 BC, Cleveland Museum of Art: Chinese ArtSize: Diameter: 21.2 cm (8 3/8 in.); Inner diameter: 5.7 cm (2 ¼ in.)Medium: jade https://clevelandart.org/art/1915.628 -- source link
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