Here the ground outside is not a view and not a wilderness to be entered quietly — it is a thing to be used. The mountain, the reef, the river or the ice decides when the day starts and what it contains, and the house is built to serve that.
The sensor is operation. A house is admitted when it runs the activity itself — its own guides, its own equipment, its own conditions reporting — rather than booking a third party on the guest's behalf. Where the landscape can be ignored for a week without the stay losing its shape, the house is classified elsewhere.
The question is declared, the sensor is published, and the ground travels with the verdict.
