What is a piece of sculpture? According to Kirsten Ortwed, it is a solid three-dimensional form and the space surrounding that form. She investigates the interplay of fixed form and space in her work with amazing persistence. Her view of space is not monolithic; it is not simply the area surrounding the sculpture, it is also the space taken up by the work itself. She places a simple cube of untreated plaster on the floor, next to it a steel construction that traces the volume displaced by the cube. An empty space and a space filled with matter face-to-face: this is a simple gesture, actually