reading the signal…
Signals / Object / Mapped places
in Madrid, MD·counted·280 all time
An eyewear professional or shop, typically displaying glasses, sunglasses, contact lenses, and eye-testing equipment.
Counted, not streamed: Optician has no time series, so it is read as a footprint across places. All-time count by city.
Things that physically exist: street furniture, signs, buildings. All-time counts.