7000 Oaks
Joseph Beuys’ key conceptual work is the project 7000 Oaks (1982–1987). In Kassel, he planted 7,000 oak trees, each accompanied by a stone column. The project transformed the city into a living “sculpture,” connecting people and nature. Beuys demonstrated that art is a process, a social act, and a collective engagement, where the growth of the trees symbolizes time, sustainability, and society’s responsibility for the environment.