In her breakthrough 1990 work Ghost, Rachel Whiteread created a positive from a negative, making a plaster cast of the interior "void" of a Victorian parlor measuring approximately 9 feet wide, 11 1/2 feet high, and 10 feet deep. Whiteread has said of this sculpture that she was trying to "mummify the air in the room," hence the title. Whiteread created Ghost over a period of three months in an abandoned building at 486 Archway Road, North London, covering the interior walls with multiple plaster molds, each about five inches thick. When the plaster dried, she peeled the molds from the walls and reassembled them on a steel frame. In this interview Whiteread discusses the process of making Ghost and lends new insight to her work.