Interlocking Forms is an abstract geometric sculpture by Donald Wilson, who intended to create "just a human kind of presence in its relation to human beings in the environment".[1][2] It is made of Indiana Limestone and measures approximately 60 inches (1.5 m) x 18 feet (5.5 m) x 6 feet (1.8 m). The piece was commissioned by TriMet for $25,000; twenty percent of the funds came from TriMet and eighty percent came from the United States Department of Transportation.[1] It was originally installed in the Transit Mall in 1977, along with ten other sculptures, to make the area "more people oriented and attractive".[2] Its condition was deemed "treatment needed" by the Smithsonian Institution's "Save Outdoor Sculpture!" program in October 1993.[1] In 2008, it was relocated to the intersection of Southwest 5th Avenue and Southwest Washington Street as part of the Portland Mall Revitalization Project.[2]
