cave painting

Real petroglyphs can be seen at http://www.nps.gov/petr/
Petroglyph: a carving or line drawing on rock, especially one made by prehistoric people. From the Greek, petros (stone) and glyphein (to carve).
Capturing the spirit of an ancient art form, in a newer form.
Looking for the artist’s signature? Look at the whole picture - it’s there!