Abstract
This article reflects on the current trend towards the proliferation of boundaries and walls. The phenomenon which stands out both inside and outside the territory of the European Union has a truly global importance. The hypothesis that we propose attributes this tendency to the affirmation of a second phase of globalization characterized by a new need for spatialization. The transformation of the boundary line to the place of governamental practices responds to its function as a block of migratory flows, an incessant process of reaction to social inequality which now extends to the transnational level. Law and lawyers have to interpret and govern these complex phenomena.