"Iliopetra" is not only Pas's most famous poem, which to some extent earned him the Nobel Prize. In the literature of his language, its position was considered analogous to that of Eliot's "The Waste Land" in the canon of Anglo-American literature. Some of the most essential features of "the new literary avant-garde in Latin America and Spain," writes Pere Zimferer, "can be correctly interpreted only if we take into account the existence of Iliopetra."
[...]
The great power of the poem lies in the combination of metered and automatic writing. In other words, in the intersection of Pas's associative, often surrealistic, imagery with a strict verse, which in the metrical tradition of Spanish literature has been associated with narrative works in particular. With the difference that Iliopetra is not a narrative poem, but a lyrical and contemplative one - an ontological song that, while never ceasing to be a deeply personal discourse, sometimes rises to the realm of pure thought.
The Greek reader who has in mind the lyrical poetry of ideas represented by "The Free Besieged" or "The Phoenix Tree" understands what I mean.

From the Translator's Introduction