Act one follows the Leaning Tower of Pisa (1173–2001) and Kowloon Walled City (1847–1994); dates and figures are historical, the city layout and the zoomed-in additions are schematic. Act two replays the story in code: red is the prescribed architecture, cream is the architecture recovered from source at each release. The order platform and its metrics are an illustrative example, not measurements from a real system.