The idea that memory is linear is nonsense. What we have in our heads is a collection of frames. As to time itself-can it be linear when all these snatches of other presents exist at once in your mind? A very elusive and tricky concept, time.
There's a preoccupation with memory and the operation of memory and a rather rapacious interest in history.
I've always been fascinated by the operation of memory - the way in which it is not linear but fragmented, and its ambivalence.