Lake Titicaca sits at 3,800 meters in the Andes, straddling Peru and Bolivia, the highest navigable lake in the world and, by legend, the birthplace of the Inca. This episode of Habitats of the World follows philosopher Philippe Simay onto the lake's floating islands, built entirely from bundled totora reeds by the Uros people. Cameras show how the islands are constructed and repaired, reed layer added to reed layer as the base beneath rots away, and how houses, boats, and even soil for cooking fires are all made from the same plant. Simay talks with Uros residents about a life that has no fixed land and no roads, only water and reeds, and asks what centuries of building a home from scratch have taught the community about adaptation. The film moves between wide shots of the archipelago drifting on the lake's surface and close observation of daily routines, fishing, weaving, and moving between islands by reed boat, framing the Uros way of life as engineering as much as tradition.