[Peter considers that for a moment, then ends up waving his hand back and forth in a sort of so-so gesture.]

Less secret society and more secret world, I guess. It's all there, it's just that most people don't know about it. They call it the demi-monde. And actually learning magic isn't the sort of thing you can stumble into on accident.

[Learning about magic, possibly. But people are a lot more likely to be able to rationalize it, at least from what Peter's found.]

Is it something anyone can do in your world, then?