abstract alloy aluminum and backdrop background belfast bent black checker checkerplate chrome cover design detail diagonal distorted dots focus foil geometric gradiant grate grates grating grey grid grill grille hole holes industrial industry infinite ireland iron layer many material mesh metal metalic metallic northern panel pattern perforate perforated piece plain plane plate polished punched reflective repeated repetition round screen series sheet shine shiny silver square squares stainless stamp stamped steel strong structure surface wall wallpaper white