Title is clickbait. Whatever you can learn from "drawing, playing with beach balls and knitting" is most likely not advanced math . (Otherwise professors in a math department would all be playing knitting and beach balls to get tenure.) Advanced math is hard. It is like toiling in the field under a scorching sun. Edit: Didn't see that the author of the article is a math professor. This method seems to work in a liber…
I'll defer to the math professor on this one.
But IMHO, math is learned by writing proofs. That is the only solid way for building an understanding.