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This work aims at designing reminiscence aids that help people remember meaningful events. With an epistemological stance of research through design, the framing of the Oblivescence Board was informed by theories in social psychology and psycholinguistics. We brought a neglected drawback (i.e. forgetting) of a transactive memory system to the center of a reminiscence dialogue, where an embodied negotiation of common grounds was constructed out of a visualization metaphor. The qualitative results from a field experimental were gathered to reframe our future direction. Several design implications are also addressed to identify the opportunities for the future work. We argue that a reminiscence aid should (1) evoke curiosity and empathy for shifting responsibility, (2) provide embodied metaphor to communicate personal significance and system's expression, and (3) interweave reminiscence activities into daily practice.