The history of anime begins at the start of the 20th century, when Japanese filmmakers experimented with the animation techniques that were being explored in the West. During the 1970s, anime developed further, separating itself from its Western roots, and developing distinct genres such as mecha and its Super Robot sub-genre. Typical shows from this period include Lupin III and Mazinger Z. During this period several filmmakers became famous, especially Hayao Miyazaki and Mamoru Oshii. In the 1980s, anime was accepted in the mainstream in Japan, and experienced a boom in production. The rise of Gundam, Macross, Real Robot and Space Opera set a boom as well. The film Akira set records in 1988 for the production costs of an anime film and went on to become a success worldwide. Later, in 2004, the same creators produced Steamboy, and later took over as the most expensive anime film. The Super Dimension Fortress Macross also became a worldwide success after being adapted as part of Robotech, and Megazone 23 also gained recognition in the West after it was adapted as Robotech: The Movie.