Gabriella Polony Mountain's work includes four major themes. The first three themes are clearly recognizable as the Cosmos, Nature, and Figural works with the fourth theme encompassing history, philosophy, and culture. In her life as an artist, Polony Mountain worked with many different medium including mosaics, weavings, sculpture, stained glass, and repousse. Sculpture is a three dimensional branch of the visual arts. In traditional forms of sculpture, the materials used were easily accessible and consisted of stone, metal, wood, ceramics. The process for creating sculpture is as varied as the materials used and include carving, modelling, molded, cast, welded. These days the sculptural form is one with fewer boundaries in terms of material and process. "Black Hole" is a lovely example of the freedom of form. Polony Mountain uses the traditional material of marble while expressing an organic form in the sculpture itself. Atop the grey-colored marble sculpture are three crown-line shapes. The center of the sculpture is punctuated by a circular hole.