drew the initial storyboards for the film in August 1994. He had difficulties adapting his early ideas and visualisations, because elements had already been used in My Neighbor Totoro and because of societal changes since the creation of the original sketches and image boards. This writer's block prompted him to accept a request for the creation of the On Your Mark promotional music video for the Chage and Aska song of the same title. According to Toshio Suzuki, the diversion allowed Miyazaki to return for a fresh start on the creation of Princess Mononoke. In April 1995, supervising animator Masashi Ando devised the character designs from Miyazaki's storyboard. In May 1995, Miyazaki drew the initial storyboards. That same month, Miyazaki and Ando went to the ancient forests of Yakushima, of Kyushu, an inspiration for the landscape of Nausicaä of the Valley of the Wind, and the mountains of Shirakami-Sanchi in northern Honshu for location scouting along with a group of art directors, background artists and digital animators for three days. Animation production commenced in July 1995. Miyazaki personally oversaw each of the 144,000 cels in the film, and is estimated to have retouched parts of 80,000 of them. The final storyboards of the film's ending were finished only months before the Japanese premiere date. Inspired by John Ford, an Irish-American director best known for his Westerns, Miyazaki created Irontown as a "tight-knit frontier town" and populated it with "characters from outcast groups and oppressed minorities who rarely, if ever, appear in Japanese films." He made the characters "yearning, ambitious and tough." Miyazaki did not want to create an accurate history of Medieval Japan, and wanted to "portray the very beginnings of the seemingly insoluble conflict between the natural world and modern industrial civilization." The landscapes appearing in the film were inspired by Yakushima. Despite being set during the Muromachi period, the actual time period of Princess Mononoke depicts a "symbolic neverwhen clash of three proto-Japanese races (the Jomon, Yamato and Emishi)." Princess Mononoke was produced with an estimated budget of ¥2.35 billion (approximately US$23.5 million). It was mostly hand-drawn, but incorporates some use of computer animation in approximately ten percent of the film. The computer animated parts are designed to blend in and support the traditional cel animation, and are mainly used in images consisting of a mixture of computer generated graphics and traditional drawing. A further 10 minutes uses