Flash rule: Bì are round jade discs with holes in their centres. When buried in the earth, the minerals change them to be multi-colored. The original function and significance of the bi are unknown, as the Neolithic cultures have left no written history. From these earliest times they were buried with the dead, as a sky symbol, accompanying the dead into the after world or \"sky\", with the cong which connected the body with the earth.

A Hole in the Sky
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