A mastery school would be a place where learners focused on their thing could go away to some remote place, free of distraction. The big idea is that the skill of learning and the skill of mastery can develop independently of whatever you're learning or mastering. So i think no matter what your kid gets fascinated with, just encourage them on the mastery path,. I think in learning how to be great at it, they'll learn how to begreat at anything else too, right?