The research is about the scientific understanding of the concept of "life" in ur-ban space and its main purpose is to explain the underlying order that is present in or-ganic cities. It was found that this order is emergent (bottom-up), a product of a self-organization, a fractal geometry that characterizes the geometries of Nature which is substantially different from the visual order (top-down) we are used to look at our cities. The biological metaphor in city planning has been used since the sixteenth cen-tury. However, this analogy has been made mainly because of its shape and appearance rather than by the investigation of their geometric properties and laws of formation. Checking the parallel between the geometries of Nature and the geometries of the or-ganic city, through the recognition of a set of patterns and emergent properties I con-clude with this work that these forms and these structures emerge for the same reason: the constraints of physical space and the laws of nature are the same everywhere. That’s why a city and a tree so strangely resemble. One of the most immediate consequences for the design cities as a result of that way of thinking, which is holistic and systemic, is that the urban form (at various scales), is not only the product of our models, wishes and inspirations as well as the result of the spatial context it is inserted. The artifact and context form an indivisible whole in a web of relationships and therefore the expression is the result of adaptation to the surrounding environment.

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Systemic thinking, Emergence, Self-organization, Fractality