Beginning about 610 B.C., vase painters showed silhouettes in black slip glaze on the red surface of the clay. Like the Geometric Period, vases frequently showed bands, referred to as "friezes," depicting separated narrative scenes, representing elements from mythology and daily life. Later, painters disbanded the frieze technique and replaced it with scenes covering a full side of the vase. Eyes on wine-drinking vessels may have looked like a face mask when the drinker held the wide cup up to drain it. Wine was the gift of the god Dionysus who was also the god for whom the great dramatic festivals were held. In order for the faces to be seen in the theaters, actors wore exaggerated masks, not unlike the exterior of some of the wine cups. The artists incised clay that had been fired with the black or they painted it to add detail. Although the process was initially centered in Corinth, Athens soon adopted the technique.