The Lost Thing

It was a nostalgic, gloomy, strange and lovely movie. I'm scared of something with this kind of atmosphere, because it's like unsubstantial and unreliable on a point that what it shows superficially is not always true and it has some dire truth, but I think this movie had a clear happy end, so I was relieved that it ended peacefully. I think the lost thing symbolizes simply something lost, but I don't have a persuasive reason at all. It seems like it has some different symbol, but I feel it's just about something lost. I'm saying this because of my lack of imagination. If I try to expand on it more, I think it symbolizes a new beginning, guessing from the ending and what the protagonist was saying at the end. He was saying that the place the lost thing arrived finally was not the place he originally belonged, but he was happy, so I think it means a new beginning or new life.