Mad River Tunnel: Entrance and Exit was completed in 1981 on a site along the Mad River in Dayton, Ohio as part of the Dayton City Beautiful program for temporary outdoor installations. I chose the Mad River because it flows not only through Dayton but also through Springfield, Ohio, where I was born. In visiting Dayton to explore possible sites along the river, a car I had been riding in jumped gear and ended up in the middle of the river, partly submerged, headlights shining up through the water, illuminating the opposite bank. It was an unforgettable image. I imagined that the car, believing in a tunnel under the Mad River, was proceeding confidently along toward the far side of the river. I decided that I would make the entrance and the exit to that imaginary tunnel. The piece consisted of two structures, one on each side of the river, each proclaiming its function in green neon. The imaginary tunnel stretched between.