The 1950s and 1960s, were a difficult period for Le Corbusier's personal life; his wife Yvonne died in 1957, and his mother, to whom he was closely attached, died in 1960. He remained active in a wide variety of fields; in 1955 he published "Poéme de l'angle droit", a portfolio of lithographs, published in the same collection as the book "Jazz" by Henri Matisse. In 1958 he collaborated with the composer Edgar Varèse on a work called "Le Poème électronique", a show of sound and light, for the Philips Pavilion at the International Exposition in Brussels. In 1960 he published a new book, "L'Atelier de la recherché patiente" "The workshop of patient research"), simultaneously published in four languages. He received growing recognition for his pioneering work in modernist architecture; in 1959, a successful international campaign was launched to have his Villa Savoye, threatened with demolition, declared an historic monument; it was the first time that a work by a living architect received this distinction. In 1962, in the same year as the dedication of the Palace of the Assembly in Chandigarh, the first retrospective exhibit on his work was held at the National Museum of Modern Art in Paris. In 1964, in a ceremony held in his atelier on rue de Sèvres, he was awarded the Grand Cross of the Légion d'honneur by Culture Minister André Malraux.