With reference to the poem by Chilean poet Pablo Neruda,
Furrer remarks that it is an expression of despair over past tragedy, misery,
and the Mapocho River as its witness, born of snow, sprung from the beak of an
eagle, winding through the "valley of ashes". … The increasingly intense
cries of the poet, the fearful questions … are answered with silence. Neruda's
text was not used here as a programmatic model for the composition of the
music. Since only fragments of his text were used, it was possible to subjugate
the language to the musical composition.