The book is dedicated to the extraordinary cardboard by Pablo Picasso depicting his masterpiece - Guernica - the tapestry of which was displayed at the entrance to the UN Security Council room. The cartoon, created eighteen years after the oil painting, arises from an exceptional collaboration - as well as friendship - between Pablo Picasso, Nelson Rockefeller, one of the greatest patrons of the twentieth century, and the artist Jacqueline de la Baume Durrbach, who recreated the painting of Guernica through the ancient art of the tapestry. The book tells the story of cardboard, while offering a critical reading of the painting, which has become a universal symbol of values linked to democracy, freedom and peace. Text in English and Italian.