and paint. The first episode to experiment with digital coloring was "Radioactive Man" in 1995. Animators used digital ink and paint during production of the season 12 episode "Tennis the Menace", but Gracie Films delayed the regular use of digital ink and paint until two seasons later. The already completed "Tennis the Menace" was broadcast as made. The production staff at the U.S. animation studio, Film Roman, draws storyboards, designs new characters, backgrounds, props and draws character and background layouts, which in turn become animatics to be screened for the writers at Gracie Films for any changes to be made before the work is shipped overseas. The overseas studios then draw the inbetweens, ink and paint, and render the animation to tape before it is shipped back to the United States to be delivered to Fox three to four months later. The series began high-definition production in Season 20; the first episode, "Take My Life, Please", aired February 15, 2009. The move to HDTV included a new opening sequence. Matt Groening called it a complicated change because it affected the timing and composition of animation. Themes The Simpsons uses the standard setup of a situational comedy, or sitcom, as its premise. The series centers on a family and their life in a typical American town, serving as a satirical parody of a middle class American lifestyle. However, because of its animated nature, The Simpsons scope is larger than that of a regular sitcom. The town of Springfield acts as a complete universe in which characters can explore the issues faced by modern society. By having Homer work in a nuclear power plant, the show can comment on the state of the environment. Through Bart and Lisa's days at Springfield Elementary School, the show's writers illustrate pressing or controversial issues in the field of education. The town features a vast array of television channels, which enables the producers to make jokes about the entertainment industry and the press. Some commentators say the show is political in nature and susceptible to a left-wing bias. Al Jean acknowledged in an interview that "We [the show] are of liberal bent." The writers often evince an appreciation for progressive leanings, but the show makes jokes across the political spectrum. The show portrays government and large corporations as evil entities that take advantage of the common worker. Thus, the writers often portray authority figures in an