classic colored communication desk doodle drawing impression ink ink well office paper pen pen drawing pot rough school sketch study table writing access-denied access-limited advice alert announcement appropriate-behavior appropriate-behaviour ban banned be-careful beware bicycles-prohibited bylaws communicating concern danger dangerous denied directions information informing law legal no-wheels not-allowed not-permitted parking pedestrian-care pedestrian-safety permission-denied prohibited prohibition prohibitions restricted restriction restrictions risk risks rollerskates-prohibited rules safety sign signs skateboards-prohibited warning warning-sign watch watch-out AM-broadcast-band AM-radio amplitude-modulation (AM) antique broadcast broadcasting circuitry console-tube-radio deteriorating dirty disused floor-standing frequencies frequency-range high-frequency (HF) informative inside long-wave (LW) longwave medium-frequency (MF) medium-wave (MW) multiband-radio neglected parts radio radio-bands radio-frequencies radio-waves range-of-frequencies short-wave (SW) tubes valves vintage waveband wavelength weathered wireless e-mail Envelope grunge letter love letter mail mailing old post post stamp postcard posting return sender stamp white write artwork black & white car creative discussion ear environment eye family graphic happy family hot food love road search see vision war zeep black computer computing control shift digital enter game gaming internet keyboard line magenta network pink purple querty red tech technology text violet advising authorised-entry-only authorized-entry-only behave behavior behaviour care caution communicate construction construction-site entry-denied entry-prohibited limited-access no-access no-entry risky unauthorised unauthorized cycling-prohibited no-bikes no-cycling symbol