Opposite City Hall, on a portion of sidewalk that juts toward the whizzing traffic, massive bronze curves interlock to form Robert Engman's Triune. The three lobes are meant to symbolize the interdependence of people, government, and industry. The work on Triune involved a series of models and four separate castings at the Crown Foundry in Chester, Pennsylvania. Engman and apprentice Tom Cullen ground and polished the final cast themselves. The finished work weighs approximately 28,000 pounds. Commissioned jointly for this site by Girard Bank and the Fidelity Mutual Life Insurance Company, the sculpture was installed in 1975.

Adapted from Public Art in Philadelphia by Penny Balkin Bach (Temple University Press, Philadelphia, 1992).