On the occasion of the Thinking-Making symposium organised by the ULB and the ULg, Karbon' proposed the ‘reflexive assembly’ of a 1:1 scale model, exploring a construction system with a wooden and straw frame developed by the craftsman carpenter Gautier Nagant. This mock-up was a life-size experiment, a moment when the act of building is shared to bring out new knowledge. At the crossroads of applied research and demonstrator project, Mock creates the conditions for an active exchange of knowledge and reminds us that the construction site can be a place of transmission, where ways of thinking and doing architecture are replayed and reinvented.