While it's true, as the article says, that the frames in the Isabella Stewart Gardner museum are still left hanging empty on the walls, it leaves out that a maj

While it's true, as the article says, that the frames in the Isabella Stewart Gardner museum are still left hanging empty on the walls, it leaves out that a major reason for that is that they can't be replaced with anything. When she created the museum, Gardner stipulated that nothing could ever be added to or removed from the collection. Thus, even if they removed the empty frames from the walls, they would just be left with empty spots instead. In order to somewhat get around this, the modern museum has built an entire annex (outside the original museum) where they can have more of a flexible collection.