civilizations – cafebedouin.org

“During Involution phase, many counterelites are trying to slice off adherents and resources at the same time. Some people even become meta-counter-elites, complaining that the counterelites themselves have strayed from the true principles, etc. The actual elites realize their status is also precarious, and some of them side with the counterelites in order to get a new base, bringing the conflicts to the highest levels. The overall tone of the movement becomes darker. Ordinary rank-and-file members hear so much criticism of the movement that it’s hard for them to stay optimistic about it. They stop talking about it as The Amazing Movement That Will Change Everything, and become defensive: “I’m not, like, one of those members of the movement, I just sort of think some of their ideas make sense sometimes.”
-Scott Alexander, “A Cyclic Theory Of Subcultures.” Astral Codex Ten. August 9, 2022

Phase One: Pre-Cycle, niche
Phase Two: Growth, moving to mainstream
Phase Three: Involution, complexity, sub-groups, elements shrink
Phase Four: Post-Cycle, established institutions, final form or return to Phase One

See also Giambattista Vico‘s La Scienza Nuova which posits a civilization cycle and is described in Wikipedia as follows:

“Relying on a complex etymology, Vico argues in the Scienza Nuova that civilization develops in a recurring cycle (ricorso) of three ages: the divine, the heroic, and the human. Each age exhibits distinct political and social features and can be characterized by master tropes or figures of language. The giganti of the divine age rely on metaphor to compare, and thus comprehend, human and natural phenomena. In the heroic age, metonymy and synecdoche support the development of feudal or monarchic institutions embodied by idealized figures. The final age is characterized by popular democracy and reflection via irony; in this epoch, the rise of rationality leads to barbarie della reflessione or barbarism of reflection, and civilization descends once more into the poetic era. Taken together, the recurring cycle of three ages – common to every nation – constitutes for Vico a storia ideale eterna or ideal eternal history. Therefore, it can be said that all history is the history of the rise and fall of civilizations, for which Vico provides evidence (up until, and including the Graeco-Roman historians).”

Pretty straight-forward parallels, with the post-cycle indicating a frozen state where institutions persist for some period before descending back into Phase One or dissolution.

“‘Technosignatures refer to any evidence of technology that could be remotely detectable, specifically through the tools of astronomy,’ explained Jacob Haqq-Misra, an astrobiologist and senior research investigator at Blue Marble Space Institute of Science, in an email interview with The Debrief. ‘Radio signals are one example of a technosignature but not the only one. Other examples are city lights, surface modifications (cities and large-scale deployment of solar panels), changes in the atmosphere (greenhouse gases like CO2 as well as industrial byproducts like CFCs and NO2), free-floating spacecraft, megastructures (i.e, Dyson spheres/swarms), and other possibilities.’
Hunting for otherworldly technology is no longer science fiction. In 2018, NASA hosted a workshop on the subject of technosignatures, and a report was developed concluding that the study of possible alien technology was an important step for future NASA missions. Today, astronomers, astrobiologists, and other scientists gather online to talk about their work and progress on the subject. The idea of systematically searching for signs of industrial or space-faring civilizations was once laughed out of the room, but now the topic is gaining rock-star cachet and serious popularity within the field of astrobiology.”
-MJ Banias, “Meet The Scientists Hunting for Alien Technology Through ‘Technosignatures’.” The Debrief. December 28, 2020.