These are just like after-images...

These are just like after-images… echoes, fossils in time, the footprints of the never-were.

— The Doctor, 'The Big Bang'

(…which I'm totally halfway through writing about. Yes, I'm late, yes, I'm borderline irrelevant. I might have finished it tonight, but it was so good I watched it again instead. Spoilers! I liked it.)