
Afterward was a doc on Machu Picchu, and I was struck by the rapid rise and fall of Inca civilization, and its remarkable communications network. In a generation or two, they conquered much of South America, and within a hundred years or so, their empire was gone. They had roads to rival the Romans, but no wheel or iron. They also had no written language, and I wondered what Harold Innis would make of that -- an empire with a huge space bias, but an oral culture. But even so, perhaps writing of some kind is necessary in any civilization that lasts: after all, oral cultures in the Innisian dichotomy still have writing, only they seem to save it for writing down the most important things in more durable media.
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