The document provides an observation assignment asking the reader to carefully sketch and observe an object or situation over multiple periods of time to notice details. It then describes a rusted metal structure the author passes along the Riverside Park bike path. The structure was originally part of the train infrastructure to transport goods into Manhattan via the river. Although the trains are no longer used, the structure remains as a reminder of the past system. The document observes how the old transportation system has been replaced with pedestrian and bike paths but the river still transports some goods. It analyzes the layered transportation infrastructure moving from the river inward and concludes we modify existing designs to meet new needs rather than total redesign, which could apply to designing new technology.