Untitled wrought iron, glass, and cast iron sculpture by Rosemarie Trockel. Part of the Köln portfolio. This article is only available in print. Rosemarie Trockel, Untitled, 1986, wrought iron, glass, cast iron, 57 x 63 x 11Â¾". Courtesy of Barbara Gladstone Gallery. From the collection of Arthur and Carol Goldberg. Part of the Köln Portfolio (BOMB 19/Spring 1987).