Experience the modernist utopia of the 1960s with the iconic "Addition System" set, a revolutionary creation by Joe Colombo produced by Sormani in 1967. Conceived as a reflection on modular living and dynamic comfort, this duo consists of a perfectly ergonomic armchair and a polyurethane foam ottoman, upholstered in original vibrant orange fabric. An aesthetic and technical manifesto, essential for any serious collector of 20th-century design.

The Revolutionary Concept of Modular Design

Joe Colombo was obsessed with the idea that furniture should adapt to people and space, not the other way around. The Addition System is the perfect illustration of this philosophy:

The Evolutionary Slat Structure: The set is designed from vertical cushion-sections of different thicknesses and heights, upholstered with polyurethane foam. These anthropomorphic slats mimic the natural curves of the body to offer enveloping comfort.

The Ingenuity of Assembly: What is not immediately apparent is that all these sections are independent. They are connected at their base by a system of plastic or metal fasteners inserted into rails. At the time, this system allowed buyers to combine the slats to create a pouf, a low-back armchair, a high-back armchair, or even an infinite sofa.

A Radical Futuristic Aesthetic: With its wave or technological caterpillar look, this set completely breaks away from the classic armchair structure (no visible legs, no traditional armrests, no wooden frame). This is Space Age design at its peak.

Analysis of the Featured Piece

The Configuration: Here you have the royal version. The armchair combines low bolsters for the seat and higher bolsters for impeccable lumbar and back support. The accompanying ottoman extends the line to transform the set into a true reclining lounge chair.

The Impact of Color: Mandarin/vibrant orange is THE signature color of Joe Colombo and the Italian avant-garde of the late 60s. It brings an incredible visual energy that immediately catches the eye in a showroom.

Technical Specifications

Designer: Joe Colombo (Cesare Colombo, 1930–1971)

Model: "Addition System" (Armchair + Ottoman)

Manufacturer: Sormani (Italy)

Year of Creation: 1967

Style: Space Age / Italian Modernism / Radical Design

Materials: Internal structure, molded polyurethane foam, concealed assembly fasteners, original stretch fabric upholstery.

💡 Gallerist's Staging Tip

« Joe Colombo's Addition System is as much a sculpture as it is a piece of furniture. Its orange color magnificently pairs with contemporary artworks or Street Art/Neo-Expressionist inspired pieces with contrasting accents. It's a piece that deserves space around it to "breathe" and assert its presence. »