Memory, for me is an ordinary instance, which when occurs isn’t very relevant. We realise its significance when we’ve come far into the future and something that happens in this future connects us to a certain incident of the past. That is how we give birth to memories. An instance of this from the passage would be when the writer looks at the ordinary people around him and each alive human being that he encounters reminds him of somebody who is already dead. Before, these dead people were just dead people he knew, but now he associates them with somebody who is alive, thus a memory of them is now created, realising their importance and structure.