Designed by Pierre Chapo in 1979, the S45 “Chlacc” chair stands among the most sophisticated and sculptural creations in the designer’s oeuvre. Produced in solid French elm, this iconic model perfectly illustrates Chapo’s relentless pursuit of structural innovation, refined craftsmanship, and timeless modernity.At first glance, the chair’s angular silhouette and delicate proportions appear almost architectural, yet the S45 offers remarkable comfort and stability. Its construction is based on Chapo’s patented “Chlacc” process, an exceptionally complex technique composed of multiple small sections of solid wood meticulously assembled and glued together. This innovative system allowed Chapo to create an elegant and lightweight structure while maintaining extraordinary strength.The chair’s dynamic crossed base supports the entire composition, while the sharply angled rear legs and precisely engineered joinery demonstrate the technical mastery behind the design. With eleven assembly points connecting seven distinct elements, the S45 represents both a conceptual and technical achievement in 20th-century French furniture design.Highly sculptural and instantly recognizable, the S45 evokes the modernist spirit and bold geometry characteristic of Pierre Chapo’s most collectible works. Today, it remains one of the designer’s most sought-after seating models, appreciated for its rarity, craftsmanship, and powerful architectural presence.