Down at the Crossover

Figure 5: The Crossover

Since you were dying to know what happens at the "crossover", figure 5 puts you out of your misery by showing you a still shot at that point in the animation. We again have two circles, this time overlapping. Amazing, no? Well, we warned you that mathematicians are amused (and indeed amazed) by strange things. Oh, sorry, did we forget to warn you?