abstract appearance background barrier bolted bolts boundary color coloration colors colour colours connected divide divided dividing fence fencing green green-sheetmetal-fence joined light metal paint painted ribbed ribs shadows sheetmetal strength strong sunlight sunshine art clockwork cogs concept cooperation decorative design drive energy engine engineering fantasy fill gear graphic industrial industry machine macro metallic network orange original parts power structure style teamwork technology teeth texture wheel work purple aging brown corrugated creation decay gray grey grunge illustration image mottled old oxidisation oxidised peeling ruin rust rusted scrapbooking ugly unique urban weathered black dark angles architectural architecture building contrast contrasting corrosion corrugations deterioration elements external perspectives rough rusty surfaces textures uneven variations wall wearing weathering choral church classical column craftsmanship flute formation group high instrument interior low mouth music musical orchestra organ pipe pipes pitch prospect religion religious shape shiny similar sound steel straight tube tubes tune affected bolt faded fading green-sheetmetal mottling