There are few things more ubiquitous in Arizona than barbed wire. It has even become a valuable collectors item, mounted on a board in a frame with various varieties. The idea for barbed wire dates back into the early 1800s. Sometimes it is referred to as "bobbed" wire. When I was young, we called it "bob wire." One of the rites of passage as children was to learn to walk through a barbed wire fence without getting a scratch and without tearing your clothes. This photo shows a stretching segment, the crossed wire in the middle is tightened by twisting the sticks in the wire.