The best types of math textbooks are the ones without pictures and drawings. For some reason today's "educators" seem to think that a child can't learn anything without a colorful picture to illustrate the lesson. There is no way to illustrate mathematics. The illustrations just wind up being confusing and distracting students from what they are supposed to be learning.
And besides, I highly doubt that Isaac Newton learned from a text that was full of colorful pictures.
"The best types of math textbooks are the ones without pictures and drawings..."
Agreed - too bad there are very few left.