Jane Wolff’s Delta Primer provided both an insight into the destabilizing effects of human interventions in an ecological system and also graphical techniques to represent changes in a system over time. I appreciated the ability of her graphics, particularly the Mount Diablo/The Delta graphic (k), to describe a location as well as the lowering of the agricultural surface over time. Causality was not implied, though, as perhaps it is more so in the section/plan/section graphic (q). However, I do feel that some of the graphics are tracings, such as the maps that appear to be framed excerpts from USGS maps. Also, the graphic explaining the meandering river seems to be more preoccupied with its graphical appearance rather than with the realistic behavior of a meandering river. While I think these graphics can strive to achieve more in the way of analysis and generative qualities, these offerings do seem relevant to our ongoing attempts to understand the complex system of cultural and ecological forces and their affects in the Venice lagoon, and to our anticipated design intervention(s).