advice alert appropriate-behavior appropriate-behaviour behave behavior behaviour black communicate communication directions inform information informing message not-allowed not-permitted permission-denied prohibited prohibition red restricted restriction restrictions sign signage warning direction environment expectorate expectorating health health-risk historic-sign no-spitting old pollution railway-platform spit spitting unhealthy appreciated area cigarettes communicating danger no-smoking symbols thanks white black-&-white gray grey greyscale access denied arch arched back-alley bricked in brickwork building city closed corrugated corrugated iron corrugations curved dark decay demolished deterioration disrepair doorstep doorways elements entrance exit exterior external grime ground-level nailed neglect no access partially demolished building safety sealed urban decay canine clean clean-up cleanliness control controlled denial denied dog doggy-do dogs-prohibited droppings exception excrement excreta hygiene lead leash mess messy pets pickup poo prepared regulations responsible rules sanitation waste allowed announcement care careful consideration dogs guidelines pedestrians permission-granted purple risk risks signs track walk walkers walking welcome attention banned blue boundaries boundary directive distance distinctive limits location painted shopping-center shopping-centre symbol wording words birds caution ducks fatal feed feeding food no-bread water-birds watrer-fowl penalties penalty thick thin access-denied angles appearance arched-architecture arches architectural-elements architecture archways barred bars contrast cream decoration decorative design facade features frontage heritage historic history light masonry ornamentation patterns perspectives pointed points segments shapes solid Somber sombre stonework style surface textures top variation variety wall