All of Frost's poetry seems to have one thing in common. It all views loneliness and loss, and is somehow connected with nature. Frost's use of imagery and nature and individuality can all be related to each other in all of his poems. He especially likes to talk about the woods. In the poems Desert Places and Stopping by Woods on a Snowy Evening, Frost refers to the woods as dark and deep. When he speaks of that he is referring to the way people act when they are depressed or sad or mad. The darker side of human nature. I think Frost had some troublesome situations in his life, where he was depressed and low. The poem Acquainted with the Night is a sad poem about how the poet is all alone and has basically hit rock bottom. There is a glimmer of existentialism in some of his poems, especially that one.
His poems seem to start out with a shadowy attitude then seem to brighten up a bit at the end. When Frost talks about his relationship with nature he is more referring to his relationship with himself. It also appears to me that Frost likes to compare and contrast good and evil, maybe not so drastically, but in the poem Design I interpret the spider as being impure and violent and the white heal-all as being pure and innocent. In the poem The Silken Tent, which is about Frost's wife, he refers to the tent ( his wife ) as free spirited and it seems as if she would float away into her own world if she wasn't tied down to earth by some responsibilities. Here I see the tent ( his wife ) as good, and the responsibilities as evil.