This chapter talks about how we use cognitive artifacts to summarize the world. He makes the distinction between the real world and the artifacts we use to symbolize and represent that real world. Examples of such things are reading, writting, and mathematics.
Ch 4
In this chapter, Normas discusses the concepts of suface and internal representation. Surface representation is what is clearly visable to us on the surface. Internal is what we can not see, what happens in the background. The concept of affordance also resurfaces.
Discussion:
This was an intersting read. The representation and writting was what seemed the most intersting to me. It made me think of how mankind has made up these symbols to represent real world objects to communicate. Also made me think of the variation in languages and modes of communicating.
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