The fractals on this site are not "escape-time fractals" like the Mandelbrot set, but iterated function systems[1], a more discrete fractal variant that starts

The fractals on this site are not "escape-time fractals" like the Mandelbrot set, but iterated function systems[1], a more discrete fractal variant that starts with an initial generating set and then replaces each element with a smaller copy of the whole set (a good example would be ferns). [1] https://en.wikipedia.org/wiki/Iterated_function_system https://en.wikipedia.org/wiki/Iterated_function_system