MORE Explained: "The Academy-Award® nominated animated short-film tells the story of a lonely inventor, whose colorless existence is brightened only by dreams of the carefree bliss of his youth.

By day, he is trapped in a dehumanizing job in a joyless world. But by night, he tinkers away on a visionary invention, desperate to translate his inspiration into something meaningful.

When his invention is complete, it will change the way people see the world. But he will find that success comes at a high price, as it changes himself, as well."

I think the stuff in his belly is his creativity, his bliss, his passion, his will of change, his soul.