Unique folding door design - video

[Jon]

The swing profile seems too similar to a standard door for it to be a significant space saver. And it looks expensive and tedious to build. Beyond amusement/entertainment, maybe an ultra-niche application: submarine, spacecraft, etc.?

Other than that, like many of the short videos we see, it seems confined to "idea value", in that it spurs us to ideate other more useful concepts.