[Sweet Georgia Brown]

And, whether, you like it or not, it is a cyclical progression - and a circular diagram explains how it works very easily.

It doesn't go round the circle. Stays within one-third of it, going back and forth. It isn't "cyclical" in any sense except that you can repeat it.

For all the grand claims about enlightening the circle diagram is, you'd think someone other than me would have come up with even one example of something the circularity actually clarifies? All I see it doing is muddling people up with irrelevancies.