How can we express today  in contemporary architecture  the geometrical-compositive possibilities of a formal conception based on modular pre-structured (prefabricated) units? And how can we compare this formal conception to the most topical needs  as those imposed by saving environmental resources or those  more dramatic  represented by the so-called mobile settlements: human flows in constant motion or the consequences of natural disasters? Is it possible find a solution  as response to these issues  which models the geometry of the temporary aggregate in relation to the shape of its basic modules? The needs of a historical analysis are rediscovered in the most topical architectural solutions for construction of temporary structures: Therefore the article suggests  a particular interpretation of fractal geometry  as the generating principle of constructive solutions that fully exploit the physical and formal properties of the elemental building units