Anziehung: strange attractors. A small rule moves a point to a new place, again and again; for the right parameters the point never settles and never repeats, and the millions of places it visits draw a shape. A seeded search looks for parameters that are really chaotic in six families of such rules, and the picture sharpens as more points arrive. Drag to bend the shape by changing two of its parameters, scroll or pinch to zoom. The toolbar finds the next attractor, switches family and palette, lets the parameters drift, saves a PNG, copies a link to the exact state, and opens the help.