In the narrow Vlaamsesteenweg in Brussels a yellow parasite hangs against the blank side wall of a townhouse: this is the head office (RDF 181) of the Rotor non-profit organisation. The construction was built entirely in industrial waste and recycled materials. RDF 181 is striking for its radical combination of creativity, temporariness and reusability: this is not just a simple site hut, but more like the ultimate big boy’s camp-building dream.