The project series documents "Clay House", an installation undertaken by Pettena and a group of his students from the University of Utah, in Salt Lake City, in 1972. It consisted of covering an entire inhabited house with clay located in a middle-class neighbourhood of Salt Lake City. The installation "was another study on the “working” of material, or rather a statement on the re-naturalization of denatured places and materials [...]." It also transformed the house by changing its colour from the other houses in the area, "all devitalized by the anonymity as well as the uniformity of their coloring." 
The project series contains photographs of the residence before being covered in clay, a photograph of Pettena's team working at covering the house with clay, photographs of the finished installation, and a photograph of the model. The project series also contains drawings for the installation, and a drawing showing four stages of the installation.
This project, along with "Tumbleweeds Catcher" and "Red Line" are part of a series of three projects entitled "The Salt Lake Trilogy". The projects were undertaken between April 1971 and March 1972 while Pettena was teaching as a guest professor at the University of Utah, in Salt Lake City. For material related to these projects, see: AP207.S1.1972.PR03 Tumbleweeds Catcher (1972) and AP207.S1.1972.PR04 Red Line (1972).