A place is a pressure environment. It acts on everything inside it before anyone speaks.
Shown
What the place presents on arrival: the light, the layout, the atmosphere that arrives before the first word.
Holds
What the place anchors. The Pieces fixed here, the history that does not leave when the people do.
Offers
What becomes available inside this place that would not be available elsewhere.
Withheld
What the place will not release without the right pressure. Not hidden. Structural. It is there and it does not move.
Shown and Withheld are the pressure pair. Holds and Offers are the resource pair. A place file succeeds when the Withheld is real enough that the pressure on everything Shown is felt before it is named.