Oh those things are super cool, soviet era display technology had a great aesthetic. This YouTuber had some great videos on them

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Looking at it, I think it might be an one of those old mono LCD displays? The video makes it look like it’s a bunch of small individual ones rather than a large continuous display.

Kinda weird to call a 1 nanometer hole a void but ok.

As the cat demon from adventure time say: “I have approximate knowledge of many things.”