Three glass funnels, one per cohort. Learners flow down as dots through five week rings; those who leave spill out of the wall at the week they leave (persistence). A beaker below fills against a dashed pre-test line (learning). A tag on top shows completion and satisfaction (exposure). Chosen interventions are pinned as tokens on the part they act on. Every decision in this scene can also be made with the buttons in the controls panel.
