Three-Generation Decay of Residues

Ong observed that residues of the displaced medium survive roughly three generations before collapsing into ruins. The first post-transition generation retains the old knowledge as lived experience—these are the people who learned under the old conditions and carry, in their cognitive architectures, the capabilities that the old medium produced. They are fluent in both the old and new media, operating as bridges. The second generation inherits the residue as fading memory—transmitted not through direct experience but through the stories, heuristics, and pedagogical practices of the first generation. They know the old medium existed, may have studied it briefly, but do not possess the embodied understanding that sustained practice produced. The third generation has no access to the residue at all; the old medium is archaeologically interesting but functionally incomprehensible, belonging to a world whose categories have been replaced. The knowledge has become arcane. This three-generation arc governed the decay of oral residues after literacy, manuscript residues after print, and analog residues after digitization. For AI, the timeline may compress dramatically—decades to years, years to