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Perforated Disc (Pi)
From the collection of Cleveland Museum of Art. Free to download, adapt and use — no permission needed.
Credit linePerforated Disc (Pi), 3000–2000 BCE. China, Neolithic period (3000s–2000s BCE). Jade ; diameter: 21.2 cm (8 3/8 in.); inner diameter: 5.7 cm (2 1/4 in.). The Cleveland Museum of Art, Gift of the John Huntington Art and Polytechnic Trust, 1915.628
