abstract aged aging background brown chemical corroded corrosion damage damaged dirty distressed ferrous frame grunge grungy hull industrial industry iron macro metal metallic old oxidation oxide paint peel peeling pitted plate reaction red retro rough rust rusted rusty scrap stain stained steel texture urban weathered weathering cable cables circuit clouds conduct construction consumer current danger electricity energy framework fuel generation generator grid infrastructure line lines national network overhead power powerline pylon science service silhouette sky station structure supply electric technology Tension tower transmission Utilities utility voltage volts wire