This video showcases how new shape rules can be defined in the Shape Machine. The rules are represented in the classical shape grammar format with the two sides of the production system, LHS and RHS, the arrow (->) in between and the two registration marks on either side of the middle arrow (->) to fix the spatial relation between them. The three simple vignettes demonstrate the full power of the seamless introduction of new rules in a design process and their incredible power in the visual command of the expressiveness of a design.