I love the notion, but also am curious how far AR can extend into primary classrooms without becoming too much of a gimmick. While the concept of the layover data is great with something like a Hololens or other wearable, there is part of me that after a couple weeks of bumping into kids face down in phones playing Pokemon GO feel that AR will need to be used efficiently, particularly with younger students where it holds that much more allure. I agree with Clay that the immediate payment per person would dissuade use, perhaps a model where they have a limited number of badges would serve better initially.