"To illustrate Luhmann's thesis, I turn to the simple example of a humble dialogue. For the last few years I have been fortunate to have the friendship of my colleague Carlton Clark, a rhetorician at the institution where I teach. Within a Luhmannian framework, this dialogue is not a communication between two systems (Clark and myself), but rather is a system in its own right. In this respect, Clark and I belong not to the system of this dialogue, but to the environment of this dialogue.... The dialogue is an entity itself that constitutes its own elements (the communication events that take place within it) and that is something Clark and I are bound up in without being parts or elements within the dialogue."
* See p. 50 and following. He even goes into a similar discussion about Luhmann on 60 and following.