The Invisible Garden is a landscape mediation installation carried out by Bruit du frigo in conjunction with the Base agency of landscape architecture as part of the redevelopment of the landscaped spaces in the Saragosse district of the French city of Pau. The Invisible Garden provides an urban Utopian opportunity for experimentation allowing inhabitants to experiment with and test their living environment while making active contributions to it. It is a form of action involving direct human consultation relating to the surveyed territory that was implemented from November 2017 to January 2020 with town hall departments and local associations. This article describes the different phases of the project and gives an account of how the network of contacts was built among individuals encountered during the collective actions. In addition to the chronological presentation of the process, extracts from the journal provide an insider’s view of the project and reveal what was at stake over and beyond the landscape itself.