abstract angles appearance architectural architecture background brown color colors colour colours contrast contrasting corrosion corrugated corrugations dark decay deterioration elements external metal old perspectives rough rust rusty surface surfaces texture textures uneven variations wall wearing weathering aged antique ash asphalt backdrop brick brushed concrete corroded crack cracked cracks galvanized grey ground grunge industrial paint painted pattern plate rasped scratch scratched stone stones tile vintage weathered yellow above arched awning coloring colouring construction curve curved curves exterior fixed height high pane protection protective shade shape shaped shapes shelter style views walls window-frame window-frames window-pane window-panes window-protectors window-shade window-shelters windows