original_query: What is the significance of the artist returning to Paris as an artist-in-residence at the Hôpital Éphémère?
query: What is the significance of Gary Hill's return to Paris as an artist-in-residence at the Hôpital Éphémère?
answer: The provided text doesn't explicitly state the significance of Gary Hill's residency at the Hôpital Éphémère in Paris.  It only mentions the event.