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If knowledge consists in nothing else than its current use for organizing Autopoiesis, it is obvious that it will be reused or not reused depending on the Sequences of state changes, depending on the History of the systems.
Thus, depending on where things go, knowledge is subject to Natural Selection. What is reused condenses into Experience and thus takes on a Form that defies all exact description.
What is not reused is ultimately no longer retrievable, as all experiences with literacy campaigns in developing countries teach us. An important consequence for our context is that adults cannot remember what it was like to be a Child. They have to reinvent the "world of the child" on the other person.
The sinking of the non-repeated takes place unnoticed (noticing would be repeating) and has an important function for systems that have to function as structurally determined systems.
In the schema Medium/Form or child/knowledge, on the other hand, forgetting is dispreferenced or even feared as mischief and sharply censored.
~
Luhmann, Niklas (1991). Das Kind als Medium der Erziehung (The child as medium of Education). doi 
, p. 32.
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