You might enjoy articles from BetterExplained. For example: https://betterexplained.com/articles/q-why-is-e-special-2-71...
There might be an article about this specific technique.
There might be an article about this specific technique.
https://betterexplained.com/articles/colorized-math-equation...
If you hover any diagram, there are options for a colorblind-friendly version.