Aldo Pellegrini (Rosario, 1903–Buenos Aires, 1973) was a very prominent poet, playwright, essayist, and art critic in the Argentinean cultural milieu. Linked from the beginning to the development of Surrealism, he directed several editorial projects. Likewise, he supported and helped spread Abstract art’s different trends, promoting several groups, such as Artistas Modernos de la Argentina[Moderns Artists of Argentina] and Asociación Arte Nuevo [New Art Association]. The text appears reproduced under the title Xul Solar, explorateur d'arcanes [Xul Solar, An Explorer of the Arcane] in his exhibition presented in the Musée d’Art Moderne de la Ville de Paris, in 1977, and in Xul Solar: catálogo de las obras del museo [Xul Solar: A Checklist of the Museum’s Holdings] (Buenos Aires: Fundación Pan Klub, 1990). Xul Solar (1887–1963) is the pseudonym of Oscar Agustín Alejandro Schulz-Solari, an Argentinean artist who had knowledge about different religions and hermetic philosophies. He produced paintings, especially water colors. Among his vast creativities, he tried to create a pictorial system he called “grafías plasti-útiles” [Plastic-useful Written Symbols”]; the “neo-criollo” [Neo-Creole] hybrid language to be used by Latin American countries and the “panlengua” [Multi-tongue] as a universal language. This text by Pellegrini has been selected—in fact he was one of the critics that promoted the spread of Xul Solar’s works in the 1960s—because it serves as testimony to his studies of the different phases of the artist’s trajectory. Also it brings to the fore his critical opinion regarding the poetic complexity of this artist, whom he considers a “visual poet” who tried to give an esoteric explanation to the world’s unity.