Even though Frost doesn't stick to one poetic form, his poems always pay close attention to rhythm and rhyme. He doesn't always use end rhymes, but his lines are full of interesting sounds. There's usually a connection between what the poem is about and what form Frost chooses to use. In this poem, the cyclical rhyme scheme reminds us of the cycle of day and night, the sun and the moon. The regular rhythm reminds us of the speaker's footsteps as he walks. Look for similar connections in Frost poems, and at the very least, a distinct and purposeful rhyme and rhythm which makes the poem fun to read aloud.