appearance barbed-tape barbed-wire barbs barricade barrier danger double fence fencing gray grey injury metal protection razor-sharp razor-wire restraint security security-fence sharp silvery spirals strands twists warning wire barbed razor barb barbed wire border boundary devil's rope escape imprisoned oppression prison razor wire secure sky wires canada conifers forest height high landscape mountain natural nature peak range Rockies Rocky Mountains series tall trees view security fence destination direction highway road route tarmac travel barbwire clouds curl curve diagonal gate get off iron no access stay away stay out angle angles deteriorating light old protect protective rust rusting rusty texture textures