This is a highly studied group of weavings that I know nothing about.
Having just acquired a few on impulse, I had to find some material to read about these. This is the time I miss spongobongo.com very much.
Here is a note that I found useful – I suspect those who care about these weavings will already know both the note and the images.
But here it is for others who are just discovering this group.
Enjoy!

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jm