This is a Lexicon entry: the mechanism, when it shows up, and the countermeasure. The full correction, with real-world cases and the audit prompt, hasn't been written yet.
When it shows up
Curated social media feeds that reinforce existing views. Professional networks where everyone shares the same assumptions. Religious communities where doubt is discouraged. Academic departments where methodological monoculture excludes alternative approaches. The oasis feels like clear thinking; it is actually shielded thinking.
Failure mode
Beliefs strengthen without being tested. The absence of challenge is mistaken for the presence of proof. When reality eventually intrudes, the gap between belief and evidence has grown so wide that correction is traumatic rather than incremental.
Countermeasure
Deliberately maintain relationships and information sources that challenge your views. Subscribe to at least one publication you regularly disagree with. Ask: "When was the last time someone I respect told me I was wrong about this?" Apply CL-4 (Disconfirming Evidence Search).
Related traps
Also connected in the map1 more, locked
Also revealed
Entry #88 of 631 in The Lexicon · see the full Lexicon