Next up in our alphabetical look at the history of chair design – the lightweight Handkerchief office chair designed by husband and wife team Massimo and Lella Vignelli in 1983. Massimo and Lella Vignelli were both born in Italy and married in 1957 before setting up their first studio in Milan. Handkerchief chair with armsA slender metal frame supports the fibreglass-reinforced polyester seat and backrest, which is available in a range of five colours. In 1965 they moved to Chicago and founded a company called Unimark International that specialised in corporate graphics and branding. The chair is the result of a five-year development process, during which the Vignellis experimented with compression-moulded plastic to find the optimum way to achieve a visually light yet robust shell. The Handkerchief is one of the Vignellis’ most enduring product designs and was recently included in the exhibition Designing Modern Women 1890–1990 at New York’s Museum of Modern Art. The Vignellis designed the Handkerchief chair for American furniture label Knoll, which they had been collaborating with since being approached to oversee a redesign of the firm’s corporate identity in 1968.