Brad Bird takes us behind the scenes of Ray Gunns massive sci-fi city

SEE ALSO: How'Ray Gunn's Venus Nova, pop star of the (retro) future, evolved Bird has been working to make since the '90s, and he's stressed Metropia's importance from the very beginning. In an introductory note on a script draft from 1996, he wrote that the one character he couldn't adequately capture on the page was Metropia. In this world, he wrote, Cities are gargantuan jewels that stretch into the heavens.