The Lost Thing: Symbol; Theme

Symbols:
The things that are lost - creativity 
The dark building where the boy first tried to take the lost thing first - things that limit people's creativeness
The city - the city seemed to be in a darker color than the room the boy opens up later in the video, which represents the coldness and ignorance of the people. 
Colors - The colors seemed to flourish where the lost thing had belonged, the creativeness. 
Bell - connection. By ringing the bell, the lost thing was able to communicate(at least a little) with the boy.

Theme:
I think the theme for this video was to put the focus on the issues that the society face such as the belonging, alienation, conformity and the suppression of creativity and imagination by using colors and unique designs. 
As a child, the boy didn't have as much suppression of creativity put onto him from other people, so he was able to imagine and care for those who didn't belong, or fit in. As he grew older, though, he started to unsee the lost ones, because of the busy-ness of the city and because he is always chased by the clock. 
There was a  border of the world that the boy lived in and where the lost thing belongs.
These colors made me think that the boy cannot enter the world of creativity somehow, perhaps because he will turn like his parents who had thrown away all the thoughts and ideas that they used to have when they were younger.