Take a look at the video embedded below. Obviously, the concept is designed to work with some form of Apple AR glasses.
Makes me wonder about the future of devices with screens, if Apple glasses ship and gain enough traction to become widely used. The glasses themselves are screens. Presumably, in addition to adding overlays to real life and existing screens, they could implement the Mac or iPad screen in the glasses interface, no need for the hardware at all, beyond the glasses themselves.
I can also imagine a future with contact lenses, so all the AR is built right into your eye coverings. And, ultimately, Apple Eyes, Apple Eyes Pro, and Apple Eyes Pro Max.