In "L’Esprit nouveau et les poètes" towards the end of his life, Guillaume Apollinaire formulated an inspiring creed: "One can be a poet in all fields: it suffices that one be adventurous and that one goes out to explore." All of its literary and artistic production, even all of its activities, result from the implementation of this admirable modus vivendi. Apollinaire was a poet, prose writer, critic, art and literature writer, journalist, playwright, film scriptwriter, letter writer, painter, and draftsman, collector, lecturer, magazine editor, impresario of all literary and artistic modernisms... How many other artists or writers have shown such creative polymorphosm, such inventive plurality, such mobile diversity in all genres?