The concepts in the "Little" books are essentially math, and the best way to explain math is by showing formulas.
The "Little" books do exactly this, except a person has taken the painstaking time of breaking everything into digestible, bite-sized portions to optimize for learning.
I don't think that the best way to explain math is to show formulas. If that were so, then the best way to learn math would be to look at mechanised formalisations of math, which is clearly not the case.
The "Little" books do exactly this, except a person has taken the painstaking time of breaking everything into digestible, bite-sized portions to optimize for learning.