Artek's Armchair 400, also known as Tank, is one of the absolute milestones in furniture design of the 1900s. Alvar Aalto designed the Tank chair in 1936 for the Milan Triennale. The voluminous chair attracted much attention and was awarded during the fair. Armchair 400 was an exception compared to Aalto’s previous pieces of furniture both for its shape and for its premises: previously had Aalto designed all his chairs for a certain architecture destination, but the Tank was designed as commission work for the Triennale. The sturdy seat and the wide armrests offer a comfortable seating experience and give the chair its characteristic, tank-like appearance. The lightness seen in Aalto’s first chairs had now changed into a more massive look and the barycentre had become lower, but the appearance is still airy and organic. Armchair 400 is available in several upholstery options: the zebra fabric is one of the original upholsteries.