This is a collaborative effort between CTRL ZAK art & design studio and designer Davide Barzaghi. It is a rare item inspired by the mathematical series. It features a frame made out of beech wood in a geometrical quartz pattern. The padding is made from volumetric cushion upholstered with natural fibers. Each chair is intricately designed and each padding element used to make the seat comfortable are distinct, making every chair unique. So each quartz armchair is a one of a kind, combining comfort with an artistic aesthetic.