Two-tier tube (<em>cong</em> 琮) with masks

Squared, hollow cylinder of the type ts'ung [cong] 琮; low form with projecting collar at both ends, one end wider; mottled light and dark gray with scattered spots of brown, reddish brown, and orange; some white surface alteration in interior; decoration: channeled and incised, grooves and corner ridges, circles and linear designs; tool marks on one collar. (One chip.)