Most of the fictional technology and architecture seen in the series is based directly on the artwork from Simon Stålenhag's book. However the scripts called for a few new devices that were not seen in the book. Writer and producer Nathaniel Halpern wanted all of the new technology to match the visual aesthetic of the book, so he asked Stålenhag to consult on all of the production design. Stålenhag even designed some of the props, like George's prosthetic arm, himself.