reading the signal…
Signals / Event / Building permits stream
in Minneapolis, MN·counted·55K all time
An official document authorizing roof work, typically printed on a permit form with project and property details.
Counted, not streamed: Roofing Permit has no time series, so it is read as a footprint across places. All-time count by city.
Things that happen: permits, collisions, crimes, inspections. All-time counts.