When an official system cannot or will not carry certain lives — undocumented status, informal labour, needs a formal institution has no category for — those lives do not simply disappear; they build parallel infrastructure instead, informal but often remarkably durable networks of mutual aid, informal transit, unregistered clinics, that exist specifically because the official version excludes them. Parallel infrastructure is frequently read as evidence of institutional failure, which it partly is, but it is also evidence of a form of autonomy that persists precisely because it was never dependent on official permission to begin with. ReasonExterior names the logic these systems operate by — a reasoning process external to, and sometimes explicitly opposed to, the official rationale that excluded them, coherent on its own terms even though it registers as illegible or invisible to the systems it runs parallel to. Studying only the official infrastructure of a city means studying half a city's actual logistics, at most.
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