Adjust the parameters, then press space.
This project builds designs with H-Fractals. To see a plain H-Fractal, set "rotate" or "rotations" to 0. "Depth" determines how many layers of recursion are used. "Rotate" determines how many degrees are rotated per rotation. "Rotations" determines how many rotations are used. The thumbnail is Depth = 5, Rotate = 179, Rotations = 90. For a cool demonstration of the H-Fractal itself, eliminate the rotation and adjust "depth" to the maximum. I wouldn't recommend doing a very large depth level if you are planning on having rotations.