I discovered Vi Hart’s YouTube page initially (I think) via Velociranga. Sadly, we both promptly forgot to remember both the URL and her name, so for the next few weeks I was desperately trying to punch in keywords that seemed relevant to what she did in an attempt to track her down.
It’s probably best if you see what it is she does rather than have me try to explain it, so I’ll just say this: She does basically everything right. She has a way of distilling mathematical concepts into extremely intuitive and beautiful doodles and diagrams, and stories. I gotta say — I’m a teeny bit jealous.