Figure 11 model, I became far too dependent on photos of the contemporary version of the structure, failing to realize, as Steward Brand notes in Buildings That Learn, that buildings change their appearance over time to meet the needs of their inhabitants (Brand, 1994). My point here in discussing the shortcomings of my digital model is simply this: a flawed structure such as the one shown in Fig. 11 is an example of the sort of problem in an open source work that a network of historians, familiar with the source material, could easily detect and quickly rectify. In turn, the same network would have the potential to show multiple interpreta- tions of a structure’s probable appearance, and to add new content to the site.