NEGREIROS, José de Almada.- K4: o quadrado azul.- Lisboa: José Almada; Amadeo Souza Cardoso, 1917.- 20 p.; 23 cm.- E. One of the rarest brochures in Almada, featuring original graphics and the curious brochure cover (number 315) with the square of blue glossy paper. The copy retains the small four-page notebook (17 cm), interspersed between pages 18 and 19, signed José de Almada Negreiros, futurist poet, dated from Lisbon, 12 Dec. 1916, announcing the exhibition of Amadeo de Souza Cardoso at the Naval League. Between pages 4 e 5 also includes a small page in green cellophane paper (134 mm.) advertising the “Obras de Amadeo de Souza Cardoso”. Copy slightly handled and with slight brown stains. Slight contact stain, caused by the section. Traces of labels on the cover of the brochure, as in all copies. Ex-libris of Casa de Marialva. Full sheepskin binding, with gold engraving on the upper cover and a blue square inlaid over the numeral 4.