Strauss and Howe argue that the last five centuries of Anglo-American history can be explained by the existence of four generational archetypes that repeat sequentially in a fixed pattern every 80-100 years, the length of a long human life, or what the ancients called a “saeculum.” These generational archetypes are: Prophet, Nomad, Hero, and Artist. Each generation consists of those born during a roughly 20 year period. As each generation moves up the ladder of age and takes a different place in society, the mood of the culture greatly changes.

~ Brett McKay from, The Generations of Men

This is some deep stuff; Deep, like Harry Seldon/Foundation deep.

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