The purpose of this paper is to examine how the Slovene artist Marjetica Potrc works with sustainability and empowerment in her “On-Site” projects. An analysis of various indicators of sustainability in the projects clarifies what the projects have in common. Balance in the relationships between people and nature stand out as a major theme in the projects. The artist works with tools such as “participatory design” where all participants are of equal importance, and “relational objects” with which the participants negotiate and transform the common space. The theory of “relational aesthetics” by Nicolas Bourriaud is applicable to the relational qualities of the projects, and the concept that all parts in the works functions as “forms” could be used here. Nature can be read as “form” together with the rest of the participants, on a “stage” of action in the projects. In all the projects one or more solutions are presented. By creating ideal prototypes of reality, where everyone, including nature, is empowered to participate on equal grounds, a solution is presented for a sustainable lifestyle.