The owner is deemed to have attached movable effects to his land in perpetuity, when they are sealed to it in plaster or lime or cement, or, when they cannot be detached without being fractured or damaged, or without breaking or damaging the part of the land to which they are attached.
The mirrors in a flat are deemed to be placed in perpetuity when the parquet floor to which they are attached is one with the woodwork.
The same applies to paintings and other ornaments.
As for statues, they are immovable when they are placed in a niche made expressly to receive them, even if they can be removed without fracture or damage.