Another question for Carl - what are your thoughts on e-ink or secondary displays on phones? I think a small display on the back of the phone would compliment the purpose of the glyphs by showing essential notifications, timers, calendar events, etc. without having to interact with your phone.
E-ink could also be used on ear product cases to display connection status and battery levels for example.
We did see a community project with an e-ink display and it looked great:

Credit: jomaga on the community Discord