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 sharp, irregular median ridge; richly mottled brilliant greens, black, and veins of golden brown, one side darker; proportions irregular; surface satin smooth. (Rim slightly chipped.)
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