Pretty cool! I remembered having a brainstorming session with co-workers about all the cool use-cases for e-ink displays over a decade ago. A product precisely like this was definitely mentioned, as was conference room displays, data center cage information, Kanban-style sticky notes in manufacturing, dynamic game pieces, among others. You'd think simple displays like the PaperMono would be as cheap as bluetooth speakers by now, but I know there are some major patent restrictions.

I can tell you this conversation happened over a decade ago because LCD Touchscreens were still more expensive than e-ink at the time.

Game pieces with integrated eink to track health/stats and other game relevent metrics would be an interesting application.