Once again you are heading off in new and interesting directions, having read this thread I couldn't wait to experiment.
I just wanted to keep it simple and see what sort of shapes I could get, after initially just adding a mess of nodes all over the place I started again and created a simple ordered set (Clip attached), that would let me try the different combinations.
Volker that little group to create Pi is way cool
Here are some interesting shapes along with the node connections. Nowhere nearly as advanced as where I guess you are but there may bo something in there
Volker I can't start to imagine how yopu got those oblong "cobbles".
EDIT Clip removed; fixed version further on