back in 2015 some researchers came up with an e-ink display device which was powered entirely by harvesting joules from the NFC connection your phone used to talk to it, and I’m honestly kind of shocked these aren’t all over the place now? http://www.alansonsample.com/research/NFC-WISP.html
@ticky but I mean
pens exist
@noiob that is true but I am not good at drawing
@noiob I want them for a phone case, primarily lol but I feel like they’d be neat as little memo pads you can whack whatever on. Fridge magnets. Notes on food containers. I’m sure I’d find something lol