One of the most important periodicals of the Portuguese literary avant garde. Collection under the editorship of and financed by E. M. de Melo e Castro. With a sheet of text- introduction in 3 languages by João Vieira, and 27 sheets of experimental visual poetry: Antonio Arago (2), Ana Hatherly (9), Melo e Castro (3 with 10 images), José Alberto Marques (9), Pedro Xisto (4). A second volume, of lesser interest and much smaller, was published later; Operaçao in the large format can be considered all published. From an edition of ca. 100 copies.