I have argued that the concepts of indeterminacy, correspondence, and complementarity are useful for developing a sense of Frost's poems and of their modernity. As illustration, a single poem will have to serve, a famous one. "Stopping by Woods on a Snowy Evening" stages its play of opposites at typically Frostian borders between night and day, storm and hearth, nature and culture, individual and group, freedom and responsibility. It works them, not "out" to resolution but in permanent suspension as complementary counters in mens animi, the feeling thought of active mind. The poem is made to make the mind just that. It unsettles certitude even in so small a matter as the disposition of accents in the opening line: "Whose woods these are I think I know." The monosyllabic tetrameter declares itself as it declares. Yet the "sound of sense" is uncertain. As an expression of doubtful guessing, "think" opposes "know," with its air of certitude. The line might be read to emphasize doubt (Whose woods these are I think I know) or confident knowledge (Whose woods these are I think I know). Once the issue is introduced, even a scrupulously "neutral" reading points it up. The evidence for choosing emphasis is insufficient to the choice.
One of Frost's characteristic devices is to set up and undermine a case of the pathetic fallacy in such a way that both construction and collapse stay actively in play. In "Stopping by Woods," the undermining nearly precedes the setting up. "Must" gives the game away, as the speaker (exercising indeterminacy) interferes with the reality he observes, imposing his thoughts and feelings on it. "Darkest" contributes to the pattern. Is the evening, say, the winter solstice, literally darkest? Could it be, given the way that snow concentrates light? Or is "darkest" a judgment the speaker projects? In the next stanza, the speaker's "reading into" nature intensifies to the point where harness bells "actually" speak. Then, as if to emphasize that such speaking is a human addition to a speechless scene, we hear that the only other sound is the "sweep" of light wind on softly falling snow. Those two categories of evidence, the self-consciously imposed and therefore suspect yet understandable human one, and the apparently indifferent yet comfortingly beautiful natural one, seem to produce the description of the woods as "lovely" and "dark and deep," a place of both (dangerous) attraction and (self-protective) threat. The oppositions are emphasized by Frost's intended punctuation—a comma after "lovely"; none after "dark," and the double doubleness of attraction and threat complicates the blunt "But" that begins the next line. Which woods, if any, is being rejected? How far does recalling that one has "promises to keep" go toward keeping them in fact?
The poem's formal qualities, while not obviously "experimental," also contribute to its balancing act. The closing repetition emphasizes the speaker's commitment to his responsibilities. It also emphasizes the repetitive tedium that makes the woods an attractive alternative to those responsibilities. This leaves open the question of just how much arguing is left to be done before any action is taken. The rhyme scheme contributes to the play. Its linked pattern seems completed and resolved in the final stanza, underlining the effect of closure: aaba, bbcb, ccdc, dddd. But is a repeated word a rhyme? Is the resolution excessive; does the repeated line work as a sign of forced closure? None of this is resolved; it is kept in complementary suspension. Similarly, the poem is clearly a made thing, an object or artifact, as its formal regularities attest; it is also an event in continuous process, as its present participial title announces and as the present tense employed throughout suggests. At the same time, the poem has a narrative thrust that tempts us to see the speaker move on (even though he does not), just as too much insistence on the poem as stranded in the present tense falsely makes it out as static. In the words of "Education by Poetry," "A thing, they say, is an event. . . . I believe it is almost an event." Balancing, unbalancing, rebalancing, those acts are the life of the poem, of the poet making and the reader taking it. Indeterminacy and complementarity are implicit in them.
From "Comparing Conceptions: Frost and Eddington, Heisenberg and Bohr." In On Frost: The Best from American Literature. Ed. Edwin H. Cady and Louis J. Budd. Durham, NC: Duke UP, 1991. Copyright © 1991 by Duke UP. Orginally published in American Literature 59:2 (May 1987).