Glass mosaic ribbed bowl fragment late 1st century B.C.-early 1st century A.D. Roman Body fragment.Translucent cobalt blue and opaque white.Slightly convex curving side, tapering downward.Ribbon mosaic pattern formed from lengths of a single cane in a blue ground with wavy, horizontal bands of white threads in parallel lines; on exterior, part of four vertical ribs with rounded exteriors, tapering downward.Polished interior; pitting of surface bubbles on interior; dulling, pitting, and faint weathering on exterior and jagged edges.. Glass mosaic ribbed bowl fragment. Roman. late 1st century B.C.-early 1st century A.D.. Glass; cast and tooled. Early Imperial. Glass