The ETH reader turns reuse from an environmental intention into a design epistemology governed by the prior existence of materials. Architectural Behaviorology supplies the conceptual frame: ethnographic attention is directed toward the behaviours of both human actors and resources, with design seeking to uncover barriers, recover latent values and construct new forms of accessibility. The Huber Pavilion project makes this operation concrete by beginning from dismantled components—trusses, panels, windows, doors, stairs and finishes—and allowing their dimensions, weight, availability and connection problems to condition architectural form. Inventory, scanning, digital platforms, computational design, fabrication and full-scale construction are assembled as one continuous research process. The project’s most important methodological inversion is therefore from specification to negotiation: design follows an available stock rather than commanding matter through an abstract bill of requirements. Its wider bridge joins circular construction to ethnography, digital material tracking and commons-oriented design, making resource histories and technical constraints active participants in architectural decision-making.