Redundancy is expensive but indispensable. - Jane Jacobs

This is both a gloomy and a hopeful book. The subject itself is gloomy. A Dark Age is a culture's dead end. We in North America and Western Europe, enjoying the many benefits of the culture conventionally known as the West, customarily think of a Dark Age as happening once, long ago, following the collapse of the Western Roman Empire. But in North America we live in a graveyard of lost aboriginal cultures, many of which were decisively finished off by mass amnesia in which even the memory of what was lost was also lost. Throughout the world Dark Ages have scrawled finis to successions of cultures receding far into the past.

I was brought up to believe that there is no virtue in conforming meekly to the dominant opinion of the moment. I was encouraged to believe that simple conformity results in stagnation for a society, and that American progress has been largely owing to the opportunity for experimentation, the leeway given initiative, and to a gusto and a freedom for chewing over odd ideas.

Beneficent spirals, operating by benign feedback, mean that everything needful is not required at once: each individual improvement is beneficial for the whole