Exhibition exhibits are recyclable, but booths often become temporary construction waste. Atelier Alter Architects designed a 24m² demountable concrete pavilion convertible to an outdoor rest pavilion. The structure features folded GRC panels with eye-level display surfaces and seat-height platforms doubling as future public seating. A cantilevered roof provides exhibition lighting control and outdoor sunshading. Using dry-hung weather-resistant GRC and anti-rust steel framing, the inverted sculpture-like form merges exhibition needs (material visibility, info display) with permanent urban functions (durable shelter, seating), proving temporary architectures can evolve into sustainable public infrastructure through modular design.