alert appropriate-behavior appropriate-behaviour area attention banned boundaries boundary cigarettes communicating communication danger direction directive distinctive entrance environment health health-risk limits location no-smoking not-allowed not-permitted penalties penalty permission-denied pollution prohibited prohibition shopping-center shopping-centre sign symbol thick thin unhealthy warning wording words abstract black blue bright calamari concept conceptual cyan exposure eye eyes fish free goofy image lamp light lights long monochromatic monochrome monotone night perspective photo photograph picture resource robot silly smile smiling Squid stock streak streaks street symmetric symmetrical symmetry tech technical techno traffic urban vibrance vibrancy vibrant vivid