Grace Knowlton’s sculptural work began with making increasingly three-dimensional paintings, until one day, a painting became a painted sphere. She worked first in clay, and then moved to concrete, sheet metal, styrofoam and various other materials. Her first interest was in the closed form’s sealed space, then in the form itself. The possibilities of the surface, whether glazed, painted or patinated was always important to her. Spherical forms gradually opened up, allowing a rich relationship between internal and external space.