http://www.cnn.com/2013/06/20/us/ten...html?hpt=us_c2

(CNN) -- The paintings and carvings have been scattered around the caves and bluff faces of the Cumberland Plateau for centuries, left behind by the ancestors of the Native American nations of the Southeast.

Now a lengthy survey of the works indicates they're all part of a pattern -- a sweeping, interrelated series that illustrates how the continent's prehistoric inhabitants saw the universe and their place in it, University of Tennessee anthropologist Jan Simek said.

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