Oz_Beachside wrote:did they relocate Big Ben to Piza?
I guess this is a reference suggesting that "the horizon is not straight".
It's an interesting exercise - test the vertical lines of the Big Ben tower (I just did this in Lightshop) and you'll find that it is dead vertical.
I think there are several visual elements that trick the eye into thinking that the picture may not be level:
- the photographer is not square to the bridge;
- the bridge isn't horizontal; it rises towards the centre;
- there is some lens distortion at the edge of the pic that is causing the building on the far LHS to "lean in".
This is a common dilemma faced by photographers, especially if using a wide-angle lens - which element of my picture do I want to be horizontal/vertical?
Sometimes, as in this case, it is impossible to get everything square unless you use the free transform ability of Photoshop.