Early concepts Following the success of his previous film,
Nausicaä of the Valley of the Wind(1984),
Hayao Miyazaki began looking for different projects to direct.
Tokuma Shoten, the company backing Miyazaki financially, proposed producing a follow-up to
Nausicaä, which he refused. He envisioned creating an old-fashioned adventure film that would be a "pleasure" to watch, for which he took a research trip to the city of
Yanagawa. He developed an initial film concept set in the city, tentatively titled
Blue Mountains, which he pitched to Tokuma Shoten in June1984. However, he stated in a later interview that he "wasn't in shape to direct" at the time, and was unable to make progress on the concept. inspired
Isao Takahata to create a documentary focusing on the city's canals instead.|alt=Boats flow down a canal between houses. The film was never produced, but the city's canals inspired Miyazaki's longtime collaborator,
Isao Takahata, to propose they create a documentary about them rather than an animation. This eventually became ''
The Story of Yanagawa's Canals(1987), which focused on the environmental effects of industry on the local waterways. A documentary, however, was unlikely to be commercially viable and had no prospect of support from Tokuma Shoten. Miyazaki therefore financed its production through his personal office, Nibariki, using the profits he had made from Nausicaä''. Takahata rapidly spent the funds on research; to recover the expense and help complete the filming,
Toshio Suzuki, an editor of
Animage at the time, recommended that Miyazaki direct another film. According to Suzuki, Miyazaki immediately agreed, and quickly developed a concept for the film based on an idea he had in elementary school. Suzuki later commented that "if Takahata had made his movie on schedule, [
Castle in the Sky] wouldn't have been born."
Pre-production Miyazaki completed a project proposal in December1984, tentatively titled
Young Boy Pazu. According to the animation scholar
Seiji Kanō, its concepts constituted a "direct rebellion" against popular animation trends at the time; instead of a protagonist with superhuman powers and a futuristic setting, the proposal featured an ordinary child within a fantastical nineteenth-century period. Although Miyazaki had expected
Nausicaä to appeal to teenagers, he realized that his audience also included many younger children. This led him to conceptualize a film catered to this demographic, opposed to the trend of increasingly
adult-oriented animations. The proposal was also unusual in that it did not adapt an already-successful
manga, which weakened its commercial potential. Feeling that it was unlikely to be green-lit, Miyazaki preemptively began work on a back-up proposal. However, Tokuma Shoten was eager to back
Young Boy Pazu, and immediately approved it to begin production, with Takahata acting as producer as he had done on
Nausicaä. Miyazaki continued working on the proposal, producing a second draft in February1985. Kanō wrote that this one contained a shift towards a more realistic perspective; refinements were made to the plot, multiple settings were described in detail, and additional characters were included. On Takahata's suggestion, Miyazaki traveled to the country of Wales in May1985 to conduct
location scouting for the film. With Takahata and Suzuki occupied on the documentary and with building the film's production crew, Miyazaki went alone. Although using real locations as inspirations for fictional settings was a common practice among Japanese animators, Miyazaki's intention for the film was only a generally Western appearance. He was significantly influenced by the region's architecture and landscapes; the
Big Pit Mine– by then converted into a museum– influenced the opening scenes set in the mining village.
Cardiff Castle, and other edifices like it around Wales, provided references for the film's Titus Fort. He also witnessed the aftermath of the
1984–1985 coal miners' strike in protest of the push from
Margaret Thatcher's government to close many of the mines. He was significantly moved by the empty facilities and defeated atmosphere he witnessed, which resonated with him politically and influenced the themes that he eventually explored.
Writing and production While Miyazaki was away, Takahata, Suzuki, and Tokuma Shoten's searched for an animation studio willing to take on the new production, but were unsuccessful. The company responsible for
Nausicaä production,
Topcraft, had also gone bankrupt around the time. They therefore decided to set up a new studio, hiring some of their previous collaborators, including – Topcraft's founder– and the colorist
Michiyo Yasuda. After scouting several properties on which to set up an office, they selected a location in Tokyo's
Kichijōji neighborhood, and were set to begin production upon Miyazaki's return.
Studio Ghibli opened on June15, 1985, as a subsidiary of Tokuma Shoten. Along with some initial sketches of the visuals, Miyazaki began working on the script on June17, the first draft of which was completed by the end of the month. The film's title,
Laputa: Castle in the Sky, was finalized. This draft's plot was similar to that of the finished film until the substantially different final act: Sheeta and Pazu remained separated throughout their time on Laputa, more scenes of violence and strife that occur there were included, and additional runtime was spent on an exploration of Muska's character. Takahata and Suzuki, who felt that this deviated from the intended adventurous mood, advised Miyazaki to make revisions. A second script draft was finished on July22. In addition to changes to the second half of the plot, new elements began to appear: the power of Sheeta's necklace became tied to her thoughts, and Laputa's natural elements were emphasized. However, other concepts that had featured in Miyazaki's concept art for several years, such as a scene in which Sheeta and Pazu pilot an
ornithopter, were cut. Miyazaki also began the
storyboarding around this time. Studio Ghibli gradually built its production staff over the following months and began work on the main animation, recruiting animators from companies they had previously worked with, such as
Telecom Animation Film,
Toei Animation, and
Nippon Animation. The
key animation was done by a team of 21, and other studios, such as
Doga Kobo and
Oh! Production, provided support for the
in-between animation. Unusually for the industry, two art directors were assigned to create the backgrounds; these were made with
watercolors or other kinds of paint on paper. By January1986, 33people were working on the project in total. Filming of completed sequences began the following month, and a teaser trailer was sent out to theaters. Miyazaki finalized the storyboards; according to Kanō, they required significant condensing, as the original plan would have run over three hours. The final runtime was just over two hours, making it Miyazaki's longest film at the time.
Animation and special effects Castle in the Sky was
animated by hand using at least 69,262
cel drawings. Hara said that the studio was "aiming for a manga-like feel", which they planned to accomplish with a limited color palette. However, they ended up using over 300shades, which Yasuda attributed to the varied lighting conditions across the film; by comparison,
Nausicaä had used only around250. The lead animator
Yoshinori Kanada was hired in August1985, and the first task he was delegated was to experiment on the flaptors– the flying machines used by Dola's gang in the film. He attempted multiple approaches to portray their insect-like wings, eventually deciding upon
drybrushed strokes to imply rapid motion. Certain special effects from the film use a combination of cel and film techniques. For example,
double exposures in which parts of the image are exposed only once, creating the effect of semi-transparency; this technique was used in the film to depict Laputa's holograms. The opening sequence uses multiple "transmitted light" techniques– in which the film is deliberately overexposed, allowing light to bleed into adjacent sections of the image– to convey the luminance of the crystal necklace. According to Hara, the majority of the cels had been completed by May1986, but around 30% required retouching during the filming process. Some of the film's shots make use of the Harmony Process, a technique pioneered by . This involved cutting cels into custom shapes and painting them in the style of a background layer, which could then be moved between frames in a manner comparable to
stop-motion animation. This allowed certain foreground elements to be highly detailed as, unlike the other cels, they did not have to be redrawn on every frame. An early shot of the
Goliath airship that Takaya worked on features Harmony elements, and a similar technique was used to animate the storm initially obscuring Laputa.
Casting and voice acting Auditions for the voice cast began in May1986, led by Miyazaki, Takahata, and
Shigeharu Shiba, the film's sound director. Pazu was initially intended to be voiced by a young boy, but they found the audition performances unsatisfactory. Shiba eventually recommended
Mayumi Tanaka, who was known for other voice roles playing children. For Sheeta, Miyazaki requested they cast someone other than
Sumi Shimamoto, who had voiced the female leads of his two previous films; they finally decided on
Keiko Yokozawa, a veteran voice actor who had also tried out for the lead role in
Nausicaä.
Minori Terada (Muska) and (Dola) were considered unusual choices, as they were both known more for their careers in live-action films. Shiba stated that Terada was selected in part due to his voice's similarity to the actor
Jinpachi Nezu's, but that he and Miyazaki had also been impressed by Terada's work on the Japanese dub of
Blade Runner(1982). Shiba considered casting a comedian from the
Kansai region as Dola, but Miyazaki found
their dialect of Japanese to be undesirable. However, after he happened to view a television program in which Hatsui talked about her past, Shiba was impressed by her voice and personality, and handed her the role. The voice recordings took place over three days in late June and early July. As further changes had been made to the story since the last script draft, the scripts given to the voice actors consisted of dialog extracted from the storyboards. Terada, who was voicing an animated character for the first time, initially had difficulty delivering his lines in sync with Muska's lip movements; however, he grasped the technique during rehearsals and, according to Shiba, made a confident performance. == Themes ==