Answer:
The poem's rhythm
Step-by-step explanation:
The structure of the poem, as in, the size and metrics, the position and length of the verses and how they're organized inside a stanza are surely directly connected to how a poem is read and the feeling that it lets on regarding the rhythm of the poem. That's precisely why there are many different types of structures regarding poetry. Some are very precise and complicated in a way that they establish a rhythm that you are almost forced to follow just by reading it, but generally it will feel natural. Sometimes, it won't be well structured at all (free verse) and will focus on the message, not the rhythm.