I added and inset the rest of the circles today. Some are barely visible as the contrast is so subtle. Others are very obvious because of the high contrast. I feel to be successful a piece must keep you looking at it and continually seeing something new. I think that will happen with this one when I finish it.
I have started to sew the squares together.
I really enjoyed the process of insetting these circles once I got the hang of it. You can be sure I will be using circles again in my work.