My mind must be near to the consistency of stone because I got lost way back in the first post of this thread. I've not read every post in this thread but even some of the later posts were beyond my comprehension. I do have a basic grasp of how a circle of fifths is played on my open G tuned guitar. I even play a number of songs that make use of that chordal relationship. However, the diagrams depicted weren't very helpful for me until I picked up my guitar and compared what was described in the pictures to what I was playing on my guitar. Then, I began to understand what some of the hen scratchins were about.