https://thenextweb.com/google/2018/05/30/googles-just-a-line-lets-you-doodle-in-ar-with-a-friend/

Earlier this year, Google released an Android app for drawing in AR called Just a Line. Doodling in AR is fun; you can make things objects float in thin air, like an art class at Hogwarts.

Problem is, when only you can see what you’re drawing, you look kind of nutso waving around your phone in the air. And I mean, is your masterpiece even real if now one else is able to appreciate it?