Setting: futuristic town
Conflict: a boy finds a thing that seems to be lost. It belonged to no one, so the boy tried to find where it belongs.
Climax: the boy was able to find where it belongs.
Symbols: something we see but cant figure out where it belongs. Perhaps, it's our inner child where we lost it somewhere, somehow along the way to adulthood.
Irony: the town and the towns people were gray, but the place where the lost thing belongs was colourful.
Theme: the lost thing may be what we need to a more colourful society.