Kramer’s idea did not come out of nowhere, either. It followed in the footsteps of the Sony Walkman, a portable cassette player. The Walkman was made possible by the invention of the cassette tape in 1963, which was itself made possible by reel-to-reel tapes in 1924, and so on back through history, everything emerging from the ecosystem of innovations before it… More at Wired.
The book the above article comes from is released today. My pre-order has been placed. Thanks to Bob.
There is another piece that looks at the world before the iPhone which is here. It’s rather good;)