Barbara Hepworth's "Oval" (1950's). British Hepworth’s adherence to abstraction was lifelong and drew on geometric as well as organic shapes. She introduced into England the idea of piercing the solid mass of sculpture with a "hole," making the object more transparent. This concept influenced the future work of Henry Moore, among others. Hepworth’s hollow interiors become more important than the enveloping material. As the viewer's eye is drawn inside the sculpture, the openings invite the surrounding landscape to become part of the artwork.