access-denied advice alert appropriate-behavior appropriate-behaviour avoid black care communicating communication concern damage danger dangerous demolition denied destruction directions fence fencing keep-out mesh message no-access no-entry not-allowed not-permitted permission-denied prohibited prohibition red risk risks risky safety sign unwanted warning warning sign weathered white wire-mesh announcement aware awareness careful caution colors colours considerate consideration Dirt dirty garbage green informing limitations limited listen lookout rubbish signs warning-sign waste waste-disposal watch-out 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equipment gadgetry inside internal linked links metal miniature no-longer-in-use numbered numbers numerals old outdated part parts perspectives plastic plastics printed-circuit small surface surfaces switches transistors useless abstract boards circuit-boards decorated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 circuitry complexity complx computer-hardware electronics lines recycling technology complex art psychedelic-colors psychedelic-colours