Long description of the image in Figure 1 of the Macroevolution FAQ:

The image a three-dimensional plot. One axis is labled Anagenesis or changing. One axis is labled cladogenesis or splitting. The final axis represents time. There is a raising, curved line going from A to B representing species A transforming into species B. Afterward the line splits into two curves: one goes to C and the other goes to D.