Imaginative Freedom of Birches
In "Birches" (Mountain Interval, 1916) Frost begins to probe the power of his redemptive imagination as it moves from its playful phase toward the brink of dangerous transcendence. The movement into transcendence is a movement into a realm of radical imaginative freedom where (because redemption has succeeded too well) all possibilities of engagement with the common realities of experience are dissolved. In its moderation, a redemptive consciousness motivates union between selves as we have seen in "The Generations of Men," or in any number of Frost's love poems. But in its extreme forms, redemptive consciousness can become self-defeating as it presses the imaginative man into deepest isolation.
"Birches" begins by evoking its core image against the background of a darkly wooded landscape:
When I see birches bend to left and right
Across the lines of straighter darker trees,
I like to think some boy's been swinging them.
But swinging doesn't bend them down to stay
As ice storms do.
The pliable, malleable quality of the birch tree captures the poet's attention and kicks off his meditation. Perhaps young boys don't bend birches down to stay, but swing them they do and thus bend them momentarily. Those "straighter, darker trees," like the trees of "Into My Own" that "scarcely show the breeze," stand ominously free from human manipulation, menacing in their irresponsiveness to acts of the will. The malleability of the birches is not total, however, and the poet is forced to admit this fact into the presence of his desire, like it or not. The ultimate shape of mature birch trees is the work of objective natural force, not human activity. Yet after conceding the boundaries of imagination's subjective world, the poet seems not to have constricted himself but to have been released.
Often you must have seen them
Loaded with ice a sunny winter morning
After a rain. They click upon themselves
As the breeze rises, and turn many-colored
As the stir cracks and crazes their enamel.
Soon the sun's warmth makes them shed crystal shells
Shattering and avalanching on the snow crust--
Such heaps of broken glass to sweep away
You'd think the inner dome of heaven had fallen.
Fascinated as he is by the show of loveliness before him, and admiring as be is of nature as it performs the potter's art, cracking and crazing the enamel of ice coating on the birch trees, it is not finally the thing itself (the ice-coated trees) that interests the poet but the strange association be is tempted to make: "You'd think the inner dome of heaven had fallen.