What is the author's style in Horizons of Rooms by W. S. Merwin?

This poem is written in free verse, which is a way of saying that it does not follow any regular pattern of rhythm or rhyme. The lines do not follow any standard length either.

The voice of the poem is usually omniscient, which means that it can give information from anywhere at any time. It is cold and logical, such as when it explains that "many have forgotten" or observes that "there are more every year who remember." At the end of the poem, the voice uses the first person plural form of address, including itself with those being described, referring to humanity collectively as "we."

Merwin often uses the poetic technique known as the synecdoche to make his ideas more forceful. Synecdoche is the use of one particular member of a group or one particular part of a thing to represent the whole. For instance, when he refers to "a heart beating," it is clear that he means a whole person, but by focusing on this one specific part he is able to use the emotional associations that come with a beating heart without wasting extra words to mention the person attached.