The Mandelbrot Tree is a fractal similar to Pythagoras trees by structure, and is sometimes considered to be one of them. It also has the same structure as the H-fractal, only instead of lines it uses rectangles. In order to give it a unique look, the neighboring branches of the tree are moved away from each other a little bit.
After an infinite number of iterations, the Mandelbrot Set fills a rectangle. Because of this, its fractal dimension must be equal to 2 (see Peano curves).