As an evolution from the PK25, the PK22 is less sculptural and more refined. The chair made its first appearance in 1956. Instead of being made from one piece of steel, the construction allows the chair to be broken down, which makes it easier to ship. In making sure that every aspect of the design counted, even the screws have aesthetic appeal. For the anniversary, the steel frame is darkened and finished in a nubuck leather.  Photo 6 of 11 in 10 Things You Didn't Know About Poul Kjærholm