barbed barbed wire danger hazard pain wire cold fence freezing frost Nyberg security snow winter barb barbs border boundary devil's rope escape imprisoned oppression prison razor razor wire secure sharp sky wires bob wire bobbed wire fence wire metal object steel steel wire cloud clouds frozen HDR ice icy ocean pole sea stribe stribes sun sunset water blades fear military terrorism close up farm old ranch wood barrier black double fencing gray grey restraint silhouettes spiked spikes spirals strands three strands twisted twists appearance barbed-tape barbed-wire barricade injury protection razor-sharp razor-wire security-fence silvery warning