When is a room not a room?

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Across
  1. 2. artwork made with paint
  2. 7. art that creates a convincing illusion of reality
  3. 8. I circle a throat with glittering stones—what am I?
  4. 11. So loyal I’d follow you through storms.
  5. 13. Seen everywhere you look, I hide by being everywhere.
  6. 15. change in form
  7. 16. large art pieces arranged in a space
  8. 17. A house where walls do the talking.
Down
  1. 1. skill in making things by hand
  2. 3. in a frightening way
  3. 4. art focused on ideas
  4. 5. I’m the itch you can’t ignore.
  5. 6. glowing under ultraviolet light
  6. 9. male rulers of empires
  7. 10. Wall paintings on wet plaster
  8. 12. type of land surface
  9. 14. Lost but not gone—put in the wrong spot.