More [1998] by Mark Osborne

More tells the story of a humanoid inventor who lives in a drab, colorless world. Day by day, he toils away in a harsh, dull, and demoralizing job, his only savior being the memories of the bliss of childhood. But at night, he works secretly on an invention that could help him relive those memories and spread their joy to everyone in his despair-filled life.