The Lost Thing is a 2000 picture book, written and illustrated by Shaun Tan. Set in the near future, in dystopian Melbourne, Australia, The Lost Thing is a story about Shaun who enjoys collecting bottle tops for his bottle top collection. One day, while collecting bottle tops near a beach, he discovers a strange creature, that seems to be a combination of an industrial boiler, a crab, and an octopus. This creature is referred to as "The Lost Thing" by the narrator.
This book was adapted into a 15-minute animated short film in 2010, directed by Shaun Tan and Andrew Ruhemann and narrated by Tim Minchin. It won the Oscar for Best Animated Short. It was nominated for the 2011 Hugo Award for Best Dramatic Presentation, Short Form.
the video originally embedded above was no longer available. I found a version with Turkish subtitles.
Should this one disappear again, at least the trailer below won't:
and here is a shorter version: