angle angles appearances architectural architecture brickwork building city closed cracked cracks dark decay deterioration Dirt dirty discoloration discolouration disrepair elements exterior external grime grimy neglect neglected old open peeling paint unsafe urban decay windows abstract art background bad blue border cement color concrete construction corrosion covered crack crackle craggy cuts damage design destruction green grunge hopelessness industrial macro material messy ornament paint pattern peel retro rough ruined rust scene scratched stone structure surface texture textured torn urban vintage wall weathered