Experimental spaces are simultaneously spaces of possibility, experience, and action. In them openness prevails and boundaries, substances, and processes are constantly re-negotiated and realigned with changing goals. This article reports on the experimental construction of a rammed earth pavilion in the garden of the ancient Hoogcruts Abbey (NL). Two construction phases, undertaken more than a year apart, resulted in the construction of earthen walls and a bamboo roof. The conceptual and material aspects of the process were also worked out through a system of documentation and graphic notation.