Clickity clack of a typewriter Ka-ching of an adding machine The bells of a rotary dial Clank of milk bottles on the porch Kling-klong of a cash register Click-and-whine of a slide projector Scratch and squeal on a blackboard Click of a TV channel knob In fifty years they’ll remember .wav bytes of Quicken, soft chimes of MS Word, and the customized rings of their cell phones.