In spite of the challenge to the principle of the unity and autonomy of law which made possible integrating the social dynamic, law continues to suffer from a lack of flexibility and openness and from a relative incapacity to grasp social reality. We shall see through Quebec's class action how law distorts and instrumentalizes the collective realities that it was supposed to grasp. Therefore, beyond its function as a rational instrument aimed at responding to social needs, we must conclude that law contributes in fact to transmit its own representation of reality in accordance with its inner logic and a certain vision of society. Moreover, and paradoxically, this position of openness on social reality leads the law to integrate certain aspects of it and contributes to a certain visibility of social conflicts.