Why Is Isao Takahata’s Horus: Prince of the Sun Called Studio Ghibli’s Origin?

Horus: Prince of the Sun (released in summer 1968 as part of Toei Manga Parade) played alongside Sally the Witch, GeGeGe no Kitaro, and Ultraseven, whose tones felt notably different. The film ran 82 minutes and is later discussed as a “starting point” for Ghibli.