Fractals derived from standard geometry by using iterative transformations on an initial common figure like a straight line (the Cantor dust or the von Koch curve), a triangle (the Sierpinski triangle), or a cube (the Menger sponge). The first fractal figures invented near the end of the 19th and early 20th centuries belong to this group. IFS (iterated function systems) Strange attractors Fractal flame L-system fractals Fractals created by the iteration of complex polynomials: perhaps the most famous fractals.