A city is a living system: it consumes resources, produces waste, and its 'circulatory system'—the road network — delivers people and goods to their destinations. But while engineers design transport arteries as rigid geometry of straight lines, nature has spent millions of years perfecting ideal distribution networks. Rivers infallibly carve their channels to the sea, a plant's leaf is veined with vessels each in its place, without a single redundant element. The new approach suggests not inventing but directly learning from evolution.

Instead of fixed blueprints — simple rules of growth. Just set the locations of 'nutrient' points, key nodes needing supply, and the Water element or a living organism will build the optimal route by itself. A striking example is the slime mold (Physarum polycephalum). This organism, lacking a nervous system, reproduces the Tokyo subway map in just hours, and faster than supercomputers do.

The mechanism of this behavior is simple: the slime mold reaches toward food while optimizing its 'tubes'—thickening frequently used paths and dismantling inefficient ones. Thus, without centralized control, a complex adaptive system emerges.

What does this give us? Road networks designed on similar principles promise to be cheaper to build, require less frequent repairs, and dynamically adapt to changing traffic flows. Behind the apparent magic lies a fundamental law — the struggle against entropy, the eternal tendency of matter toward disorder. Nature plays by these rules at all scales: from microscopic leaf veins to galaxy-scale patterns visible in the night sky. The analogy with rivers and leaves is not coincidental: though the systems differ in detail, they share a common principle — minimizing costs while maximizing the efficiency of resource distribution.