Try: https://turbowarp.org/1048577909/fullscreen?hqpen set pixel size to 1, zoom in to an edge (thumbnail shows example). Adjust v, threshold, color, or zoom. Arrow keys move. Zoom helps show self-similar pattern (fractal).
I added v, and changed the variable that is colored, but it is otherwise a Mandelbrot fractal, albeit a fishy one. Zoom with turbowarp reveals dragonesque shapes. Fractal (self-similar) arising from iterating a simple rule. The essential algorithm is simple.
