Devil's rope...

History of barbed wire.
Originally uploaded by mdboxer.

"To realize the significance of and enjoy the beauty of fences, a person has only to travel beyond the enclosed storage yards and cyclone-fenced freeways into the open countryside. There, standing amid colorful country vistas, are a multitude of fences varied in structure and made from an astounding array of materials." Delbert Trew, An Essay on Fences.