MIT neuroscientist Ila Fiete argues in a Perspectives essay published in The Transmitter that the brain builds itself through self-organization rather than a genetic blueprint, with genes encoding compact local chemical rules instead of point-by-point wiring diagrams. The human genome contains roughly 20,000 protein-coding genes, while the human brain contains roughly 100 trillion synaptic connections—a ratio that makes direct genetic blueprinting a mathematical impossibility. Fiete writes that "the genome is a recipe, not a blueprint, for the brain," distinguishing a blueprint that specifies every element's position and identity from a recipe that specifies a process from which structure emerges. The essay contrasts this view with the 20th-century blueprint model, including Roger Sperry's chemoaffinity hypothesis (1963) and Lewis Wolpert's positional information theory (1969), which share an architecture in which global structure flows from information specified in advance and read locally. What fills the gap is self-organization—the spontaneous emergence of ordered, large-scale structure from local interactions among components following simple rules. Fiete draws on Alan Turing's 1952 paper "The Chemical Basis of Morphogenesis," which showed that two diffusing chemical species—an activator that stimulates its own production and a faster-diffusing inhibitor that suppresses it at a distance—could spontaneously break a spatially uniform starting state into a periodic spatial pattern. The essay states this reframing has concrete implications for how scientists study neurodevelopmental disorders and for what a genetic variant can and cannot