Nephrite as a surface treatment. A lot of nephrite tools and amulets are known since the Early Neolithic (VII mill. BC) to the Late Chalcolithic (V mill. BC) on the Balkans (mainly Bulgaria; also in Greece, Serbia, Croatia) from two or more unknown sources - Balkan "nephrite culture". Such tools are found in the Later Neolithic of Poland (from the most probable local source Jordanów), Sardinia (Italy) (unknown source) and Switzerland (Kostov, 2005; 2013). Single or just a few finds of nephrite artifacts are reported also from some other European countries. During Neolithic times, the key known sources of nephrite jade
The Continuity of Life Forms The Continuity of Life Forms The Continuity of Life Forms is a mosaic by Willard Martin, installed at the Oregon Zoo in Portland, Oregon. "The Continuity of Life Forms" is a large mid-century modern mosaic and one of the earliest remaining works by local architect and artist Willard "Will" Martin, who also designed Pioneer Courthouse Square. It is made of 20 panels and measures approximately tall and wide. The work has been installed in two locations at the Oregon Zoo. According to the organization, "The Continuity of Life Forms" "[captures] a panoramic sense of history and being — the forces