Nancy Holt's "Sole Source" was first presented on the occasion of the Independent Artists' Seminar in Dublin, during September 1983, and to date it has not been posthumously presented.  In this System Work, gravity is the power source, with water from an elevated reservoir flowing down through the structure of pipes into a pre-existing ditch.

In 1994 Nancy Holt developed the unrealized project Falling, Flowing, Still in response to an open call for a sculpture commission at Portland International Airport in Oregon. In this unrealized sculpture, Holt brought together materials from the geological depths of Oregon and the air above its highest mountain, connecting places normally experienced as distant from one another.