The quality by which the atmosphere of a place — its air, its ambient sound, its social energy, the light — becomes an irreducible ingredient in the enjoyment of an experience. The thing itself has not changed; only its context has.

• "The wine we brought home from the vineyard was technically the same bottle — but it had lost its luftoir entirely."
  The taste was unchanged; what changed was the air around it.
• "Street food eaten at a plastic table on a hot corner has a luftoir no restaurant can replicate."
  The exhaust fumes and noise are not incidental — they are part of the dish.
• "Reading the same book in a mountain cabin, she noticed the luftoir of the place slowing every sentence down."
  The prose hadn't changed, but the stillness made room for it.

Luftoir is often mistaken for nostalgia, but the two differ in orientation. Nostalgia reaches backward — it is the bittersweet ache for an atmosphere that has already passed. Luftoir is present-tense. It is felt in the moment, a live awareness that the air around you is doing something to the thing in your hand.