The speaker of "Sound and Sense," who seems to be a member of the Poetry Police, plays with the way the meter of a poem can imitate the content of the line. He gets an A+ in prosody, the study of the way verses are put together. In the larger poem, he criticizes the current poets of his day that follow the rules of iambic pentameter too closely and write boring poetry. He proposes a higher rule that he argues the ancients followed – matching sound and sense.
The rule of art (as opposed to chance) enables a varied prosody without verging into disorder.
Because this poem is attempting to teach us about poetry, it creates an atmosphere of authority, which adds a sense of order to its prosody that might be considered disordered by some standards.