Azul... (1888) by Rubén Darío is considered the foundational work of the Modernismo literary movement in Spanish-language literature. Written when Darío was only twenty-one, the book is a collection of poems and short stories that revolutionized the use of language, imagery, and rhythm in Hispanic poetry and prose. Published in Valparaíso, Chile, Azul... reflects Darío's fascination with beauty, art, and imagination. The title—meaning "Blue"—symbolizes idealism, purity, and the infinite, evoking the color of the sky and the sea. The book blends fantasy, musicality, and sensual imagery, drawing inspiration from French Symbolism and Parnassianism while introducing a distinctly Latin American voice. Among its most notable texts are El rey burgués, Sonatina, and El velo de la reina Mab, which explore the tension between materialism and artistic idealism. Through mythological references, exotic settings, and musical language, Darío defends art's power to elevate the spirit above the mundane. Azul... not only transformed Spanish literature but also established Rubén Darío as the "Prince of Spanish Letters," inspiring generations of poets to seek harmony, innovation, and beauty in expression.

Rubén Darío (1867–1916) was a Nicaraguan poet, journalist, and diplomat, regarded as the father of Modernismo. His innovative style fused French symbolism with Latin American sensibility, revitalizing Spanish-language poetry. Works like Azul..., Prosas profanas, and Cantos de vida y esperanza shaped modern Hispanic literature.