Seems like the next logical thing to apply this trichotomy to is fields of study. Uh oh, looks like math is just a hobby now. But since I've convinced someone t

Seems like the next logical thing to apply this trichotomy to is fields of study. Uh oh, looks like math is just a hobby now. But since I've convinced someone to pay me to do that hobby, I guess I don't care what label it's given.