NEGREIROS, José de Almada.- A invenção do dia claro.- Lisbôa: “Olisipo” Apartado 145, 1921.- 45 [3] p.: 1 retrato; 25 cm.- B. Original edition of one of the author's rarest titles, illustrated with his self-portrait. It transcribes one of the conferences that most impressed Fernando Pessoa, who that same year would choose this text to inaugurate his publishing house Olisipo. Copy, with slight browning, retains green booklet covers (with flaps), with serious support failure affecting the top cover (±50x20 mm), on the inside margin and on the spine. It is worth mentioning that the covers wrap around the first and last sheets.