"C. Part Three: Earth Maintenance
Everyday, containers of the following kinds of refuse will be delivered to the Museum:
-the contents of one sanitation truck;
-a container of polluted air;
-a container of polluted Hudson River;
-a container of ravaged land.
Once at the exhibition, each container will be serviced:
purified, de-polluted, rehabilitated, recycled, and conserved by various technical (and / or pseudo-technical) procedures either by myself or scientists.
These servicing procedures are repeated throughout the duration of the exhibition."
--from Mierle Ukeles' Manifesto for Maintenance Art 1969