Photo # RAP4
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His and Hers Photography
©  Ross V. Walker 2012
Coso geometric petroglyph designs, Naval Air Weapons Station, China Lake, CA
Geometric designs are thought to represent patterns generated during a trance.  Some could be light patterns created by the human optical system (entopics).
The location on the Navy base has isolated the petroglyphs from the public, so vandalism is minimal.