The art of Norman Rockwell, Edward Hopper and N.C. Wyeth inspired the design. Whiting strove for colors both evocative of the time period in which the film is set and also representative of its emotional tone; for example, Hogarth's room is designed to reflect his "youth and sense of wonder." That was blended with a style reminiscent of 1950s illustration. Animators studied Chuck Jones, Hank Ketcham, Al Hirschfeld and Disney films from that era, such as "101 Dalmatians", for inspiration in the film's animation.