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Now you have me interested. Do you have any links to follow up on?

I’m afraid I don’t. I saw a documentary on NHK about it, but they’re unfortunately bad about distributing their content outside Japan.

This one?: <https://www.youtube.com/watch?v=ev93FNJy7Ws>. Here in SoCal, we can get NHK World over-the-air.

Good find! In my recollection, it was in Japanese, but it’s probably the same content.