There is never enough time or effort or vision to make sure things are fixed. We must suppose they are (or were) somewhere here, in the vicinity of the place we are (or were) standing, in the present continuous, within the limits of what we are ready to appreciate. I can hardly imagine a memory that has no stills. The trick is in admiring the thing the trick tricks you into believing, while knowing the trick.
Ghosts : the need for accompanied presence.