Helen Frankenthaler's sculpture work is less well-known than her groundbreaking paintings or prints. The artist began creating sculptures later in her career, around the 1970s. She approached sculpture with a similar aesthetic philosophy as her paintings, emphasizing abstract forms and vibrant colors.

Frankenthaler's sculptures were mostly created using steel and painted with acrylics to bring in her signature use of color. The sculptures, like her paintings, are abstract, and they often play with form, space, and balance in intriguing ways.

One notable sculpture of hers is "Madame Butterfly" (2000), a painted steel sculpture that was displayed at the Storm King Art Center in Mountainville, New York. It is characteristic of her sculptural style: abstract, evocative of natural forms, and brightly colored.

As with her other work, Frankenthaler's sculptures blur the lines between the various forms of media she used, translating her unique approach to painting and printmaking into the three-dimensional realm. Even though these works are not as numerous or as famous as her contributions to painting and printmaking, they nonetheless add another dimension to our understanding of Frankenthaler as an artist.