At 7:56 a.m. on 9 August 2012.
In my little world one often encounters buildings that are still perfectly sound and serviceable with walls that are askew. Let us say hypothetically that one of those skewed walls finds its way prominently into a photograph that I like otherwise. My amateurish rule of thumb has long been this. If that tilting wall bothers me too much, I simply discard the photo and forget about it. If that tilting wall bothers me only a little, I show the photograph to friends. What I definitely do not do, however, is deploy this or that software in an attempt to make the wall that which it surely is not, that is, a vertically true wall. There lies the path to insanity.