How does the Java Script code that draws Menger's Sponge on canvas work?

Question

JavaScript

I found a Java Script code on the web that draws the Menger Sponge on the canvas.

The code blows my mind a little. I would love to hear your comments on it.
I would like the same functionality, but in a more understandable form. To show the students.

Answer 1

In this comment , everything is pretty well chewed. We can help you