In Dōgen’s Shōbōgenzō, poetic and metaphorical language functions as a primary vehicle of realization rather than as ornamentation. Zen understanding concerns a reality that eludes fixed concepts, so direct, logical exposition alone cannot fully disclose it. Images such as the “moon in water,” “flowers in the sky,” or “painting a rice cake” do not simply illustrate doctrines; they unsettle habitual ways of thinking and point beyond them. By refusing to resolve into a single, neat meaning, such metaphors invite a mode of engagement that is experiential rather than merely intellectual. The reader is drawn into an intuitive resonance with teachings like emptiness, impermanence, and Buddha-nature, instead of being given a final, closed explanation.

This style of expression also embodies the non-duality that Zen proclaims. The fluid movement of Dōgen’s imagery, and his willingness to blur boundaries between subject and object, sacred and ordinary, mirrors the seamlessness of the reality he describes. Natural phenomena—mountains, rivers, valley streams, plum blossoms—are not treated as symbols pointing away from themselves, but as direct manifestations of the Dharma. In this way, poetic language demonstrates that enlightenment is not elsewhere; it is disclosed in the very fabric of everyday experience. The aesthetic dimension thus becomes inseparable from practice, showing that the manner of expression is itself a form of realization.

At the same time, Dōgen’s metaphors work to undermine attachment to rigid views. Their deliberate ambiguity and paradox disrupt linear logic and challenge the tendency to cling to doctrinal formulas. By affirming, reversing, and reconfiguring familiar ideas through layered images and wordplay, his language loosens the grip of fixed notions about self, world, and awakening. This strategy resonates with the broader Zen use of kōan-like rhetoric, where evocative phrases are meant to be turned over in contemplation rather than solved as conceptual puzzles. Poetic speech thus serves as both a mirror of non-dual reality and a skillful means for breaking through the very habits of mind that obscure it.