This artist’s talk reflects on Art without an Object but with Impact, a project realized by the Swiss artist George Steinmann together with Bauart Architects Ltd Bern for the ARA Region Bern Ltd. The transdisciplinary process for the new headquarters of Switzerland’s leading wastewater treatment facility (each day 90 million liters of wastewater is cleaned by the wastewater treatment system before it is returned to the river Aare) began in July 2008 and ended in December 2011. The artistic project was based on two interventions. In Intervention A, water from three curative mineral springs of the Engadin valley in Eastern Switzerland has been added to all water-based material and elements used for the construction of the building. Although the effect of this step remains immaterial and invisible, the mineral water itself and its energy are in the building as ‘information’, which penetrates the material and creates a resonating space. In Intervention B, a Water Advisory Board (Wasserbeirat) has been convened to discuss the various problems pertaining to water in a roundtable. Resulting from the roundtables, a “Forum for Water” (Wasserforum) was established in the new building. The close cooperation of all participants, including the construction workers, as part of the artist’s strategy, neutralized the traditionally decorative role of the artist and leads to a critical examination of the artist’s role in building-site art projects in general. By combining sociopolitical, aesthetic, natural scientific, and communicative elements, Steinmann presents a transdisciplinary contribution to the field of art as research.