In other words, you are not looking at the actual past at all. You are looking at a present trace of the past. It is like seeing the tracks of a bird on the sand. I see the present tracks. I do not, at the same time, see the bird making those tracks an hour before. The bird has flown, and I am not aware of him. From the tracks I infer that a bird was there. From memories you infer that there have been past events. But you are not aware of any past events. You know the past only in the present and as part of the present.
