We ran rather late talking about annotation based code diagrams for visualizing how a system is articulated from a purposeful point of view.
Ward described and demonstrated annotation-based diagramming of the Federated Wiki search service scripts and related files, with the notion that this is a larger concept or technique which could be helpful in other contexts - microservice architectures, deployed systems, after-incident reviews.
An earlier presentation from Chris about Regenerating Sonora, and a discussion of how to engage with large organizations which show up in the area with different agendas.