The OPEnS lab contributed a demonstration of the new water quality sampling system they are developing as part of a “Rube Goldberg” water machine that passed water from unit to unit.  This was organized by Rolf Hut as a collaborative effort between institutions (each one contributing one or two units to the Rube Goldberg machine), and was widely seen by conference participants as “street art” immediately outside the conference.  This was the first time such an effort had been tried, and brought many smiles, and much publicity for the OPEnS initiative.