The 1970s saw a surge of growth in the popularity of manga, Japanese comic books and graphic novels, many of which were later animated. The work of Osamu Tezuka drew particular attention: he has been called a "legend" and the "god of manga".  His work—and that of other pioneers in the field—inspired characteristics and genres that remain fundamental elements of anime today. The giant robot genre (known as "mecha" outside Japan), for instance, took shape under Tezuka, developed into the Super Robot genre under Go Nagai and others, and was revolutionized at the end of the decade by Yoshiyuki Tomino who developed the Real Robot genre.  Robot anime like the Gundam and The Super Dimension Fortress Macross series became instant classics in the 1980s, and the robot genre of anime is still one of the most common in Japan and worldwide today.  In the 1980s, anime became more accepted in the mainstream in Japan (although less than manga), and experienced a boom in production. Following a few successful adaptations of anime in overseas markets in the 1980s, anime gained increased acceptance in those markets in the 1990s and even more at the turn of the 21st century. In 2002, Spirited Away, a Studio Ghibli production directed by Hayao Miyazaki won the Golden Bear at the Berlin International Film Festival and in 2003 at the 75th Academy Awards it won the Academy Award for Best Animated Feature.