Beaker 10th century The decoration on this beaker is divided into two rectangular panels, each with a large double-line V that cuts the field into triangles. There are plantlike motifs in the central triangles and stylized birds in the flanking ones. These patterns were created with a rotary, abrasive-fed tool after the beaker had been shaped and cooled. During this process, most of the glass surface was ground away so that the design would stand out in relief against the background.. Beaker 453851