“7000 Oaks – City Forestation Instead of City Administration” (1982) by Joseph Beuys
This ambitious project became a five-year effort in which he and others planted 7,000 trees of various types throughout the city of Kassel in Germany, each with an accompanying basalt stele as a marker. The solid stone form beside the ever-changing tree symbolically represents a basic concept in Beuys’ philosophy, that these two natural and yet oppositional qualities are complementary and coexist harmoniously.