The Bleeding of Legal Rules between Rights and Limits

This paper, starting from the consideration that modern migratory flows and the enormous circulation of people and rules imply the "dying out" of alien principles and practices on the canvas of the host legal system, wants to ask itself about the "limits" beyond which the host system (and its socio-cultural tradition, or rather its national "spirit") ends up reacting to protect its integrity and within which instead the host system itself welcomes and accepts the "discoloration" or contamination. In a microcomparative way, some aspects of the English, French, Italian and Japanese systems will be compared to evaluate the answers to phenomena of contamination or dying of "alien" rules on the system of autochthonous rules and to evaluate the degree of systematic coherence and "hold" of the latter.