I was glad to hear of the “catch up week” as I too was finding it hard to get through this chapter. I have always understood the concept of edge. Pattern seems more mysterious. I much appreciated the videos that others posted. Thanks. For me, it helped clarify a few things. It seems that patterns are the result of some rule, law or process that takes place and therefore (in my opinion) the pattern may not be as important as the rule followed or the process developed.
For example, if one does swales on contour, a pattern emerges that can be quite beautiful but the designer did not necessarily think about the pattern but thought more about slowing water across the land and proceeded with a design based on this.
Another example is the spiral galaxy or vortex ring. If Mollison explained the underling law behind why a galaxy is shaped like a spiral, I missed it, given my lack of being able to focus on this chapter. However, a vortex and galaxy shape results from the law of conservation of angular momentum.
Here is another related video that hopefully will result in some insight into this chapter.
(if this link puts you into the Mechanical Universe main menu go down the page to lesson 19. Angular Momentum. Other lessons may apply as well such as lesson 16. Harmonic Motion)
I can think of at least one very purposeful good use of a vortex in permaculture - the vortex filter commonly used in aquaponic and pond systems.
While reading this chapter I was thinking of all the other stuff I needed to get done and I did learn some new things. However, I could not help but think that if I took the time and calm my mind there might be some very profound insights I could uncover. Perhaps I will revisit this someday in a more settled state.