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 slight median ridge; closely mottled yellow, green, and reddish-brown with some black veinings; grayish-white areas of incipient disintegration, more profuse on one side; material thickest at perforation and slopes gently to an evenly thinner rim; saw marks on one surface. (Breaks on rim on one side only.)
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