circle circular curved curves edge edges edging effective flexible flies fly-killer fly-swat hand-power handle household-device household-item lined lines pattern pest-control plastic radiating rectangular red slits smooth spaces surface surfaces symmetry texture textured abstract alone angles appearances blue clip clipping clothes-peg color colored colors colour coloured colours fasteners fastening grip gripped held help hold light linear peg secure security single washing antique Australia bakelite black communication connecting connection crank crank-magneto cranking historic history magneto-telephone office-equipment old party-line PMG-(Post Master General) pre-digital retro telephone vintage wind-up