Minimalist and sustainable, thanks to the use of just two materials, the Aisuu Chair and Aisuu Side Chair (designed by Ginger Zalaba) are a tribute to the project by Otto Kolb – the designer’s grandfather – with whom Walter Knoll worked for years. The chairs have a structure in steel tubing and a seat in leather, stitched by hand. The Aisuu Chair, the more austere of the two, is made with three tubes that meet at six points; though welded, they seem like a single piece. The Aisuu Side Chair has wing-shaped armrests; with respect to the original project, it has been optimized in terms of ergonomics and angle.