The constructal theory of global optimization under local constraints explains in a simple manner the shapes that arise in nature.

It is the thought that flow architecture comes from a principle of maximization of flow access, in time, and in flow configuration that are free to morph. The constructal law proclaims a tendency in time about the generation of animate and inanimate flow systems: "the maximization of access for the currents that flows through a morphing flow system.

" This theory replaces the belief that nature is fractal, and allows one to design and analyse systems under constraints in a quest for optimality. This theory allows the design and understanding of natural systems, thermal dissipators, communication networks, etc..

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