If you're fascinated by tracking how trends in anime develop, you need to see "Anime Opening Origins," a trip along the early through lines in anime's opening credits.
I remember watching a video a year ago that brought up a number of re-used actions that always seem to appear in anime openings and it is certainly interesting to see that they were still used even in these older series.
These sort of cinematography techniques don't really come off as "ripping off" one another as they do in the videos highlighting more contemporary anime, where it's much more blatant.
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