As usual, I was going about at random, checking out whatever happened to strike my fancy. So I happened upon this rundown old building (natch), I entered, and I started photographing the interior, paying particular attention to the stairwell (also natch).
I had a feeling about this particular shot.

So I got rid of the most obvious visual cues to its original orientation, turned it upside down, and it became quite disorienting. In fact, there were moments while I was playing with the image when I actually became confused as to which direction was the true "up".
Then I got the bright idea of reversing the chiaroscuro, and the confusion became compounded.
Because in actuality the top photograph is the upside-down one; the second one is the right-side-up original! The sequence starts with the image "flopped" (not to be confused with "flipped"), but it sure looks normal, doesn't it -- at least to the casual gaze -- especially in the negative version.