The challenge of memory lies not only in bridging times or in overcoming the gap between the past and the present, between the foreign and the familiar, in order to reconstruct what has been lost and reclaim what has been forgotten. The difficulty of memory can also stem from the fact that the past itself eludes retrospection, that it is dark and obscured, unrecognizable and unrememberable. Within the past, there may be unfinished business that resists memory while simultaneously yearning for it. In various ways, historical reflection has engaged with this unfinished past. Critical history seeks to give voice to suppressed narratives. Cultural history aims to unlock the unfulfilled potential of innovations that could not prevail. Psychoanalysis reflects on the subsequent solidification of.