To speak of city borders and urban limits and to go beyond the official historical limit of the lost structure of the city walls leads the concept of limit itself to a new possibility of form for the many and varied urban cultures, practices and ways of living. One key factor to inform this planning viewpoint of the contemporary city is that of the differences between peripheral environments. The relationship between the city and ‘territory’ is currently characterised by the vanishing condition of the distinction between separate configurations. Differences, specificities and thresholds, it is on the basis of these concepts that planning is perhaps still able to understand and formalise the distinction between the many and varied urban landscapes and therefore to provide a basis for a shared meaning for common space.
Keywords: Limit; threshold; urban landscape