background barriers borderline boundaries boundary concept fenced fenceling fencing green greenery hedge height high maze nature plants sky trees wall corner fence grass highway old palings road timber bamboo post barbed wire off-limit sunset direction Orange Cone safety farm field pasture railing wooden fence 3D abstract border bridge decision person Rendered water wood historical meadow Pembrokeshire stone traditional wales welsh blossom edge England hedgerow rural spring spring hedge Sussex alert appropriate-behavior appropriate-behaviour area attention banned blue cigarettes communicating communication danger directive distance distinctive entrance environment health health-risk limits location no-smoking not-allowed not-permitted painted permission-denied pollution prohibited prohibition shopping-center shopping-centre sign symbol unhealthy warning wording words decorative grey irregular patterns stones structure structures texture textures wallpaper penalties penalty thick thin