angles appearance barriers block blocks boundaries circles circular coloring colors colouring colours constructed contrast contrasts cracks discoloration divided dry garden leaves moss path pathway plants ringed rings sectioned sections shade shadow shadows shrubbery shrubs stepping-blocks sunlight sunshine surface surfaces texture textures trees wood wooden afterglow amber atmosphere barrier breaking-through bright burn-off bushfire changing circle cloud color colour dark darkening daylight fiery filtered fire fires halo hazardous Haze hazy health-hazard heat light low-visibility red skies sky smoke smokey smoky unhealthy visibility access-denied access-limited advice alert appropriate-behavior appropriate-behaviour behave behavior behaviour black caution cautious communicate communication denied directions entry-denied entry-prohibited keep-out no-access no-entry not-allowed not-permitted permission-denied prohibited prohibition restricted restriction restrictions safety sign warning abstract backdrop background chips close-up concrete construction contrasting deliberate design designed disaplayed display embedded gray grey heavy mottled near patterns protective rough secure shaped shapes size Sizes slab slabs smooth solid stones strength strong textured thick wall architectural architecture basic brick brick-wall bricks brickwork building cement colored coloured exterior external firm mortar perspective perspectives security standard traditional-brick-wall variation varied various wallpaper beams black-and-white connections derelict fence fence-posts fencing forgotten fragile futile grass grayscale greyscale impressions ineffective joints monochrome neglected old old-farm outdated photography post posts protection rustic split-rail-fence style useless weathered woodgrain barricade cone construct danger direction drive equipment forbidden highway isolated line marker marking object obstacle orange pavement plastic reflective repair road signal site speed stop street striped stripes symbol traffic transportation travel under white work cutout arrest barb barbed barbed wire barbwire blue capture captured control freedom get out hope hopeless inside iron jail locked in metal metallic no entrance. outdoor outside prisoner shape sharp steel strands system three twisted wire aqua cold cool cooling darkened environment environmental lines movement pier reflection reflections rippled ripples rippling slowly-swirling swirling turbulence turbulent vibrancy vibrant water water's-edge wavelets waves winter wintery access armed authorities authority availability available badges cars communicating deployment flashing-lights law law-&-order lights motor-bikes National-Day on-duty on-the-job order patrols police police-vehicles power presence regulations responsible Singapore symbols traffic-control uniforms vehicles weapons