"The Fourth Turning" (1997). ~80-year Saeculum divided into 4 turnings: High, Awakening, Unraveling, Crisis. Current Crisis turning began ~2008. Predicts climax in 2030s. BST integration: the 80-year cycle nests inside the 138-year Phoenix. Generational archetypes (Prophet, Nomad, Hero, Artist) repeat. The current "Hero" generation (Millennials) parallels the GI Generation who fought WWII. The structural pressure geometry of the engine captures what Strauss-Howe describe narratively.