We did in school on a coil winding machine, and also learned the math.

I don't rember the winding part being that much fun. :)

It was something old, akin to this: https://www.youtube.com/watch?v=Y-GyMYZ8yTU

RF transformers (in forms of various coils, chokes, baluns, etc) are more interesting and complex to analyze. I once winded three of them, and none worked. I thought I finally found an article that explains the subject, well, not a chance ;-)

I was hoping for monad transformers.