abstract background defend enclose fence grass green grid home house metal protect texture wire barb barbed blue corrosion dangerous decayed jail knot old protection rust rusty security sharp skies sky warning wires audio cable cables chord chords connect device electric electronic electronics equipment jack plug video elements grip household object isolated items mechanics tool pliers plyer things tool tools wire cutters big chains construction heavy hook iron large steel sundconst Automotive tire boat gas lifebelt lifebuoy Personal protective equipment rope safety ship wood clouds conductor electricity high insulator power pylon tower transmission voltage pole poles railway train wiring barbed wire barred entrance gate gateway new zealand restrictions rockpile rocks signs stones wellington