Cuckoo Journal is a tangible, voice based journaling system that reframes daily reflection as a slow, physical ritual embedded in time. The project takes the form of a contemporary cuckoo clock, a historic domestic object long associated with rhythm, routine, and inheritance. Traditionally passed down as heirlooms, cuckoo clocks mark time through repetition and small moments of theater. Our team deliberately chose this form to update it for today’s world, transforming it from a passive timekeeper into an active instrument for reflection. Once per day, the user winds the clock forward, triggering three mechanical birds that emerge sequentially to ask guided spoken prompts derived from the Rose–Thorn–Bud framework: what went well, what was difficult, and what lies ahead. Rather than writing or typing, the user responds in their own voice, allowing tone, pauses, and emotion to become part of the record. These daily reflections accumulate into a growing personal archive that is not organized through screens, lists, or searchable timelines, but through the embodied act of winding the clock itself.