Re: obvious intuitive explanations are ignored.

I remember squinting at the definitions in my calculus textbook for a full 10 minutes before realizing... oh my God, if this had been a 5 second animation, I would have understood it instantly.

I remember being rather upset! "If it's so obvious and intuitive, why didn't they just say so?"

I want to say, "well, unfortunately you cannot put an animation in a textbook." But that's actually false!

Even as a child I made flip book animations. And there was plenty of room here in the margins for several of those :)