Students there studied monumental inscriptions from Roman forum rubbings. He and his studio made precise rubbings of the inscriptions. It contains calligraphy, rubbings, and scrolls. Ink rubbings of the steles are available for sale. It also holds ink rubbings from Ming-era steles originally located by a synagogue in Kaifeng. Rubbings and possibly 3-dimensional replicas were preserved in libraries and collections elsewhere. The original is lost, but there are a number of fine tracing copies and rubbings. More commonly, people use butcher paper to create stone rubbings. These works take the form of tattered, bound journals made of earth rubbings. Rubbings are commonly made by visitors to the US Vietnam Veterans Memorial. Initially only rubbings of sporadic individual letters could be made, due to the overgrowth. One of the company's services was researching patterns based on photos and rubbings. Mulder examines rubbings of the object and falls into a dangerous coma. His plays include "Easy Down Easy" (1987) and "Brass Rubbings" (1989).