I believe because it falls across multiple lines without obvious breaks. The line breaks are important because the first word of each line gets emphasis.
The main element of Modernist poetry that is evident in this excerpt is that its sentences fall across multiple stanzas. This is an innovation that was developed during the Modernist period. Modernist authors were greatly concerned with the creation of new methods and styles of literature. They believed that the Modern Age consisted of avoiding the repetition of old patterns and instead developing the "new." One of the classical approaches that they disregarded was that of traditional meter and structure.
