Some of the world's most famous artworks are nomadic. They travel from one institution to another, borrowed and lent across museums so that art admirers in continents too far to touch can view them. They are gently packaged and shipped overseas, ushered into temporary homes by art handlers who take their jobs very seriously. (And sometimes not so seriously.) It's an arduous ordeal, one not without its hiccups, but essential nonetheless.
For example, without these kinds of arrangements, the fine people of Boston wouldn't be able to feast their eyes on the unfinished work of "The Kiss" painter, Gustav Klimt. And that would be a shame.