Teikoku Kagekidan

I don't see any author's perspective or self-expression here.

Perhaps. But in my opinion, both the visuals and the song contribute to one of the best ideas in human history, which intensely inspires me to create and is why I watch the series of this franchise, as well as other series like Doctor Who, Stargate, or even Lexx. Maybe that's why I understood the message of the video and was moved by it.