advice alert announcement appropriate-behavior appropriate-behaviour aware awareness care careful caution colors colours communicating communication concern considerate consideration directions Dirt dirty garbage green informing limitations limited listen lookout not-allowed not-permitted permission-denied prohibited prohibition risk risks rubbish safety sign signs unwanted warning warning-sign waste waste-disposal watch-out white angles board circuit-board color colored colour coloured components computer connected connecting connections disconnected dusty electrical electricity electronic equipment gadgetry inside internal linked links metal miniature no-longer-in-use numbered numbers numerals old outdated part parts perspectives plastic plastics printed-circuit small surface surfaces switches transistors useless abstract boards circuit-boards decorated decorative devices distinctive fusible-metal-alloy interlinked patterns permanently-bonded printed-circuits solder solidify access-denied asbestos avoid black damage danger dangerous demolition denied destruction fence fencing hazard hazardous health-risks keep-out mesh message no-access no-entry red requirements restrictions risky circuitry complexity complx computer-hardware electronics lines recycling technology complex art psychedelic-colors psychedelic-colours