Making internal process external
Naomi Miyake, in her paper "Making Internal Process External for Constructive Collaboration" explains in which way how human cognitive processes not only rely on internal knowledge but also on a physical externalization of the interaction of those processes with the nvironments, made up of people and artifacts. The first and simplest example is the affordance of an object : the shape 'affords' some action. Another easy-to-get understand is the journal/log that could be seen as a way to store, sort and share information. I also like this example :
The mere location of a tool recently used can be interpreted for instance as a sign of the progress of the work
This paper would also be interesting : Miyake, N. (1986) Constructive interaction and the iterative process of understanding. Cognitive Science, 10, 151-177.