Koh uses two-dimensional photography to create holographic, three-dimensional constructions. Photographs are digitally printed on transparent film and laminated between clear plastic sheets. These sheets are then stitched together with a heat gun to form a sculptural shape. This photo sculpture has a transparent surface that reflects the images of the world, and yet reveals the emptiness of its interior space. The overlapping planes create an illusion of indefinable depth and varying imagery, depending on the viewing angle. Pink Curtain is a box-shaped translucent work. Photographic images of outer walls of a building are used for its sides, creating an imaginary structure. The photographs were taken in Seoul in 1992.