Do you consider your keyboard to be a fragile thing? Meet the glass keyboard by [BranchNo9329], which even has a glass PCB. At least, I think the whole thing is glass. Image via [BranchNo9329] via ...
One of [CNLohr]’s bigger claims to fame is his process for making glass PCBs. They’re pretty much identical to regular, fiberglass-based PCBs, but [CNLohr] is building circuits on microscope slides.