Once teams were formed and had an initial idea of what they wanted to do, they went through a model-building process to refine their ideas.
Building physical models helps to ground an idea for systemic intervention in practical ideas. Participants are instructed to build models in which each piece represents an actual physical entity in the world. Models shouldn't be too big, trying to show all of the systemic dynamics of a social system, but should rather represent the nuts-and-bolts aspects of a practical and manageable project. They should accurately represent something possible but ambitious.
Then each team presents their idea to the group as a whole, and receives feedback from other team members. The group is invited to ask questions of the presenting group, not to be answered but to inspire critical thinking and new ideas.
Below you'll find photos of the model building session.