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L-systems perfectly illustrate how massive visual complexity can be mathematically derived from a handful of discrete axioms.<p>It’s a core mental model. When building generative systems, the designer's job fundamentally shifts from manually drawing the final shape to strictly engineering the initial recursive rules. A design system that cannot be expressed as a recursive function is usually just arbitrary styling, not a true system.
For the computational linguistics aficionados: L-systems are context-free grammars by another name.