October 8–31, 1971. These seventy black-and-white photographs are documents from a specific social and professional milieu, inserted into an artistic context, along with their certificate of origin by Jacques Charlier, who was an expeditionary designer for the Technical Service of the province of Liège (STP) between 1957 and 1978. They are assembled nine by nine in eight panels, and are flanked with a certificate written on the Provincial Administration’s letterhead. Charlier confirms that these photographs he has been removing from their context since 1964 have been part of the documentation of the Provincial Technical Service’s project offices and that they were carried out by André Bertrand, the Service’s head Operator.