When f has two attracting fixed points there are usually two prominent colors in the graph of G and those colors appear in different ways. When f has a fixed cycle of order two, the two prominent colors will appear symmetrically.
This the same function as the previous but zoomed out by a factor of one billion. The two fixed points correspond to the green color and a yellow somewhere between the colors in the spiral.
This is the same function as the "Christmas lights" image shown on the home page.