Neruda uses nature imagery in "Tonight I Can Write" when he describes his lost love and their relationship. When the speaker describes the "endless sky" and his love's "infinite eyes," he suggests that their relationship achieved a cosmic level. Neruda also uses images of nature to illustrate the speaker's state of mind. When he writes of the stars that are "blue and shiver in the distance" he suggests the distance that has formed between the lovers and the coldness of the speaker's isolation.