the them of "the lost thing"

My opinion of the theme of "the lost thing" is the importance of cherishing character. The object which found by a man is a symbol of character. Everything in their city is looks same.  Eventually, he and the machine(?) discovered colorful, bright, and vibrant world.  These days, people is too busy to think about what we are. This movie alerts the dangerousness of the life like ours. The colorful world was so attractive to us and the man. Because the city in this video is not interesting. We are all finding our character.