This work introduces the concept of a digital mirror as an external mechanism for phenomenological reflection of outputs produced by large language models (LLMs). Unlike common introspective approaches that attempt to induce self-reflection through internal states, verbal self-critique, or feedback loops integrated into the generation process, the digital mirror operates exclusively at the level of the finalized model output. The approach is inspired by an optical analogy: rather than “looking inward,” the model observes its own expression as an external object. We formally define a mirror function f(Ot; u, C, λ) composed of surface extraction, projection into an observer-dependent perceptual space, mirror inversion along a chosen axis, and rendering of the reflection. This framework separates externally observable behavioral phenomena from internal generative mechanisms and opens a space for new forms of output calibration, style self-regulation, ethical reflection, and experimental analysis of LLM behavior. Implementation notes and a minimal prototype demonstrate practical feasibility. The digital mirror is discussed as a modular and extensible apparatus with the potential to contribute to safer, more consistent, and more interpretable language models.