During the 12th century B.C.E., Greece and its islands were overrun by the Dorians, whose uncultured rule led to a collapse of the arts and crafts industry.During this time, the more secure setting of Athens became the centre for ceramic ideas and development. This consisted of mostly Sub-Mycenaean ware, followed by a more common Protogeometric style, confined to the rendering of circles, triangles, wavy lines, and simplified geometric designs. Protogeometric vases are one of the earliest types of Greek art to survive since much of the sculptures, architectural, and mural paintings have disappeared. Geometric art went far beyond just the circular designs of the Protogeometric period. Vases were made according to a specific system of proportions,
