I think this has historical roots in the japanese [1] https://en.wikipedia.org/wiki/TRON_project from the eighties which also had something like these [2] http://xahlee.info/kbd/TRON_keyboard.html

And from Sci-Fi Anime from the time, and afterwards.

This was their [3] https://en.wikipedia.org/wiki/Fifth_generation_computer project, and those keyboards belonged to it. So that concept has been in the air from then on, at least.

Sounds interesting, do you have some links?

There isn't a great single resource I can point to, but try the twitter account Yusha Kobo[0], which is a keyboard shop in Tokyo. Not just their posts, but if you look at the feeds or likes of people they retweet, you should be able to find a bunch of examples.

[0] https://twitter.com/yushakobo