Regarding teachers, I'm thinking of lecture classes with 100 students. A similar feature would be great in other opt-in environments like parties or other situa

Regarding teachers, I'm thinking of lecture classes with 100 students. A similar feature would be great in other opt-in environments like parties or other situations where one wants to meet people. Regarding teaching mechanisms, for instruments the advantage of AR over custom hardware is that you don't have to buy a special learning piano or guitar, you can just use the one you've got with your AR glasses.