In all sorts of ways you travel and visit other lives that you might have lived. Merely visiting is not enough you need to have lived that other life all the way through with all its sorrows and joys, its gains and losses, perfect moments and dull half-hours - like the life you are actually living, which might as well be someone's visit to the life you call your own. They especially enjoy those moments in it when you are, in this way, aware of being bound into it. But, you say, they will go on to experience other lives while you only have this one. And they do, infinitely - look at all the different lives - and you do - provide them with these complete identifications of finiteness. This s a kind of metaphysical déjà vu.