The Spirit House chair, produced by Nienkämper in a limited edition of 21, references the addition's interlocking, self-supporting prismatic structures and the void between them—a location Libeskind calls the Spirit House. "It's a place to reflect and experience, just like the chair," he says. Constructed from 14-gauge stainless steel, the 35 ½-inch-tall design can be set in five different positions. 257 Finchdene Square, Toronto, Ontario M1X 1B9, Canada; 800-668-9318; nienkamper.com.