[Memory]... is a system of near-infinite complexity, a system that seems designed for revision as much as for replication, and revision unquestionably occurs. Details from separate experiences weave together, so that the rememberer thinks of them as having happened together. The actual year or season or time of day shifts to a different one. Many details are lost, usually in ways that serve the self in its present situation, not the self of ten or twenty or forty years ago when the remembered event took place. And even the fresh memory, the 'original,' is not reliable in a documentary sense....Memory, in short, is not a record of the past but an evolving myth of understanding the psyche spins from its engagement with the world.