The grouped pattern is derived from the simple 7x1 dotted kolam.
Simple 7x1 to Complex
Simple 7x1 dotted kolam grouped to make a complex kolam.
People call this pattern Brahma's knot. It is a dotted kolam. An advanced design which is an extension of this pattern could be found at:
http://www.ikolam.com/node/209
Hope you enjoy it! 
Comments
sujatha
Fri, 2016-01-15 23:52
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Very nice to learn how to make a big kolam with a basic small one