Thus, sociology can explain how persons can change society; the influence of the environment (the people) on the system (the society), the so-called ""structural coupling"". In fact Luhmann himself replied to the relevant criticism by stating that "In fact the theory of autopoietic systems could bear the title "Taking Individuals Seriously", certainly more seriously than our humanistic tradition" (Niklas Luhmann, "Operational Closure and Structural Coupling: The Differentiation of the Legal System", Cardozo Law Review, vol. 13: 1422). This approach has attracted criticism from those who argue that Luhmann has at no point demonstrated the operational closure of social systems, or in fact that autopoietic social systems actually exist. He has instead taken this as a premise or presupposition, resulting in the logical need to exclude humans from social systems, which prevents the social systems view from accounting for the individual behavior, action, motives, or indeed existence of any individual person.