In Greek art, the period ca. 1050-900 BCE. The decoration of pottery in this period  is sober, restricted to simple abstract elements such as horizontal bands, concentric circles and semicircles. Unlike the style of the Geometric period that follows, Protogeometric pot painters typically left much of the surface of their pots undecorated. Web resource here.

Protogeometric amphora from Athens. Ca. 975-950 BCE. British Museum, London. Photo: Marie-Lan Nguyen.