"Plumb Bob" is a permanent installation commissioned by the Oregon Arts Commission and Portland State University. The piece is installed in the 2nd and 3rd floor stairwell of Portland State's Shattuck Hall, home of the University's Architecture Department. We are interested in the concept of the plumb bob because of its simplicity, elegance and its clear representation of the force of gravity. The plumb bob has an ancient history in both disciplines--art and architecture–as a way of finding the 'true vertical' in construction (as far back as the Egyptians), as well as a way of finding the center of gravity in representational drawings, paintings and sculpture from life subjects. The plumb bob is an accurate connector of two points of reference–an artifact that presents the exact vertical alignment (or path) from point A. to point B. Installed in the stairwell of Shattuck Hall, the plumb bob connects the classrooms on the 2nd floor with the 3rd floor studio facilities.