How does Octavio Paz use imagery in Duration?

In the second stanza, after the first line, Paz focuses each subsequent line on the human being as surrounded by nature, and with each line the imagery becomes more imaginative. Imagining rain as a bed for a sleeping person is reasonable, because a person could sleep in rain or on top of the puddles it leaves. The "bed of wind" mentioned in the third line, however, as is the idea of singing in a bed. The mention of wind draws a connection from this stanza back to the epigraph from the I Ching . The last line in the stanza makes a reference to kissing in a bed of sparks, which is a sexual reference, implying the electricity released in passion.