The Kortrijk region grew on flax production and trade in the nineteenth century, and the decline of its textile industry in the twentieth left many sites empty for decades. Most of these buildings are structurally sound, but their ceilings are deteriorating, and safety concerns and the cost of redevelopment keep them closed. Instead of renovation, the project proposes a spatial tool that inhabits these buildings for a time. Scaffolding tarpaulin, produced locally by a former linen manufacturer, is low-cost, durable and flexible. Sewn into a continuous surface of 2,700 square metres, it forms a protective enclosure that shields visitors from falling debris. The tarpaulin hangs from multiple hoisting points on the existing steel structure, a feature these factories share, so it can be installed within a single day without invasive work. Because nothing is fixed permanently, the building is left unchanged when the installation moves on. The first installation took place at Vlaspark in Kuurne, a former flax storehouse representative of many sites across the region that remain in transition. FOS offers a framework for reusing these spaces as temporary public places: a minimal intervention that brings new life to existing urban resources. By giving them spatial continuity, it invites citizens and organisations to start their own activities and events. To show what this could be, the project included a projection mapping installation with Berlin-based artist Omar Elkammar. Moved from one building to the next, FOS can open the region’s abandoned heritage step by step, so that people rediscover what they had stopped seeing.