UPDATE: You can find the breakdown of this material on my Substance Magazine article.
https://magazine.substance3d.com/using-shape-grammar-to-generate-patterns-with-seref-atilla-gurbuz/
Download the pattern generator for FREE https://gum.co/xatLP
This node allows you to create thousands of different patterns with ease. I created a rule-based pattern generator with Shape Grammars' (Stiny & Gips, 1972) algorithms. A basic set of rules applies to the initial shapes of circles to create new ones.
Pattern Generation Variables