Birches by Robert Frost Poem and Analysis. “Birches” is a beautiful, if somewhat clumsy, poem about youth, nostalgia, and spirituality, as you will see in the analysis below. Frost explores the flexibility of the birches, while being equally adaptable with his interpretations of the poem's deeper themes and ideas. Long questions and answers. 1. Frost uses many different literary devices in his poetry. Identify two literary devices that Frost used in the poem Birches Answer. Literary devices are used to connect with,