Working with my current client has really reinforced for me how much traditional documentation methods involve flattening reality. The client is dealing with a large body of troubleshooting information, in which there are complex relationships between issues the user experiences, the symptoms that help narrow down the issue, the configurations under which symptoms can occur, and the underlying faults, misunderstandings, or frustrated expectations that cause the issues.
The relationships between these factors are complex, many to many, and multi-dimensional. Any presentation of these relationships on paper, or on a piece of glass standing in for paper, involves flattening them. This flattening is necessitated by the media, which is, literally, flat. It is also a result of the limits of our own ability to visualize and express complex multi-dimensional relationships. Whether it is a result of thought patterns developed by a five-thousand year experience with paper as the media for externalizing and preserving our thoughts, or whether the limit is innate, we flatten as we attempt to understand.