As I said yesterday in the post about gigantic cassette tapes from the 1950s, mocking old technology (and the awe and wonderment that accompanied it when it was new) is low-hanging fruit. But it isn’t just for a laugh that we marvel at yesterdays technical detritus. It also serves to remind us that the technology we are currently awash in is, in fact, marching to its own steady drumbeat toward oblivion. And what will replace it? Watch this Radio Shack ad from 1990 for their portable phone and then stare at your iPhone for a few minutes. Your mind will start to go to places you’d never thought it capable of…