background backgrounds board circuit color colors component computer electronic electronics part parts power technologic technology athletes athletics compete competition fitness lane markings running second sport sports stadium track two activity bars climbing equipment exercise frames gym keep fit outdoors regime training workout angles circuit-board color colored colors colour coloured colours communication components connected connecting connections Dirt dirty disconnected dusty electrical electricity gadgetry inside internal linked links metal miniature no-longer-in-use numbered numbers numerals old outdated perspectives plastic plastics printed-circuit small surface surfaces switches transistors unwanted useless camera camera surveillance cctv closed circuit tv external monitoring observation public security camera surveillance camera video camera big brother surveillance abstract boards circuit-boards decorated decorative devices distinctive fusible-metal-alloy interlinked patterns permanently-bonded printed-circuits solder solidify