National Museum of Asian Art
Disk (<em>bi</em> 璧)
ca. 3300-2250 BCE
Perforated disk of the type pi [bi] 璧; bored from both sides, leaving pronounced median ridge; mottled pale to olive greens and golden browns, grayish-white coating of incipient disintegration in all cracks and veinings; cutting irregular, many saw marks and scarred areas as well as strata fissures. (Rim damaged in three areas.)
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