[nitros]

It's also becoming possible to have transparent rigid PCBs as of quite recently: https://www.pcbway.com/blog/News/Transparent_Rigid_PCBs_Laun...

Naturally it does mean you can't have a ground pour, so the PCB needs to be designed to look nice with it.

[llbbdd]

This sounds sick, I looked for a photo and couldn't find one that seemed to be this specifically, just lots of the flexible ones, do you know if there's a photo ref somewhere?