''I see birches bend to left and right; you must have seen them Loaded with ice; You may see their trunks arching in the woods; And climb black branches up a snow-white trunk.'' Since father died of tuberculosis when Frost was 11 years old, perhaps boy is representative of his childhood. Frost being the only boy in his family, had to become the man of the house at a young age. So the poem represents his dreams of being innocent once/hop this helped
