A Barry Martin formula. Not a fractal but an attractor. Change a,b and c to get different shapes. Zoom in and out to fit it on the screen and change the color to your liking. The image is a=0.2 b=-0.4 c=-1.1 zoomed at 26. Another good one is a=-0.6, b=0.2 c=0.9. Post your discoveries.
