Recurring motifs 5 -- Venn diagrams

Technically a Venn Diagram shows overlapping circles, thus helping explain the mathematical concept of sets and how an element can be a member of more than one set at the same time.  But I used that name for any array of overlapping shapes, a motif that I did many times during my 2012 stitching project.

Sometimes I would put some french knots into one or more of the enclosures.