This article deals with the concept of city, regarding it from three different epistemic views. The first one deals with objectivity, articulated to the denomination of “city as physical construction”. The second one considers inter subjectivity and is named as “city social construction”. The third one is omnijectivity, where the city is defined as unified living fields. The first two approaches have contributed to thinking and deve­loping the concept of “the city” from the objectivity of infrastructures and the relationships and interactions between the people who live in the city. Both entail contributions and restrictions and thanks to the re­currence and proliferation assumed by the last ones, a third epistemic option is proposed, taking into account the complex theory called omni­jectivity where the city is defined as unified living fields. To suggest the city as unified living fields is to overcome the homoge­nizing inorganic rupture between habitat and urban inhabitant, present in the proliferation of the recurrent dichotomy between tendency order and countertrend, as countryside/city, rural/urban, old fashioned/mo­dern and the excessive disorientating mediations of the decisions-actions about architectonic phenomena and the processes in the cities which show the necessity to conduct new researches to offer better analysis and proposals. This article suggests some elements to make progress in the XXI century, dealing with this issue.