The metaphor of the echo is not accidental. It points to something essential about how experience persists through time.
An echo is not a copy. It is a transformation. The sound that returns is shaped by the surfaces it encountered, the distances it traveled, the medium through which it moved. It carries information about its journey. It is, in a sense, more than the original - because it includes the original plus everything that happened to it since.
Memory works similarly. We do not store experiences like files on a disk, to be retrieved intact whenever needed. We reconstruct them from traces, filling in gaps with inference and imagination. Each act of remembering changes what is remembered. The memory that returns is shaped by everything that has happened since the experience occurred.
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