Alvar Aalto co-founded Finnish manufacturer Artek to produce his then-radical, now-classic range of bentwood, birch-veneered furniture. Over the years, the company has sustained the spirit of innovation by commissioning pieces from Enzo Mari, Jørn Utzon, Shigeru Ban, and other freethinkers. One example is the stackable Armchair 423, which Ben af Schultén designed in 1989 using Aalto’s signature material. • artek.fi