After the completion of Chicago architect Jeanne Gang's award-winning Starlight Theater in Rockford, IL, PHA again collaborated with Studio Gang to design this marble tension structure that is currently on display at the National Building Museum in Washington, D.C. Sponsored by the International Masonry Institute, the Stone Curtain was built by Matt Redebaugh of IMI.

The translucent marble curtain is a complex three-dimensional shape that hangs in tensile equilibrium from the ceiling. The shell contains no metal reinforcement. The marble alone carries the tension.

Studio Gang led the design process through its many innovations on a tight budget and schedule. PHA worked closely with Studio Gang from concept to execution, together with engineers of record Thornton-Tomasetti. PHA created the geometric algorithms to generate a consistent family of 620 interlocking jigsaw pieces.