Castelli Poster, Concert May 13, 1972, Signed by Richard Serra and Philip Glass, “This poster was made by Richard Serra to announce an Ensemble concert at the Castelli Gallerry at 420 West Broadway on May 13, 1972. The poster is made on very high quality paper and is similar to the type of print Serra continues to make - a very dark charcoal-like surface. Signed by Serra and Glass”, coll. JG