Vitra Standard Dining ChairThe Vitra Standard chair, designed by Jean Prouv in 1935, is a prime example of his working with thin steel sheet, a material he had long been looking for during his previous work with cast metal. Chairs take the most strain on their back legs, where they bear the weight of their user's upper body. Prouv took this into account very succinctly with the Standard Chair. Tubular steel piping is enough for the front legs that take relatively little strain,