For those of us who like to take photos in which buildings sometimes appear, perspective is one of the basic problems of photography. Originally this was corrected using bellows cameras where the lens plane and the film plane can be manipulated independently, offsetting the image circle to shoot up at things while keeping the film level.1
Personally, I am a big fan of the total dumbass kitchen sink approach to perspective correction. By which I mean:
- Shoot with an ultrawide lens and crop the bottom off2
- Hold the camera over your head (easier with an articulating screen or a waist level finder but you can just shoot a bunch of frames and pick the best)
- Fix it in post!
- All of the above
The advantage of the dumbass kitchen sink approach is that you do not need to carry a tripod and thanks to mirrorless digital cameras, ultrawide lenses are more accessible and compact than they used to be.
Anyway, that's why you can see my shadow like a goofy cartoon character at the bottom of this image : )
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I say "originally", but lots of folks still shoot with large format bellows cameras. Hell, I have a 4x5 field camera a few feet away from me as I type this; I just don't use it anymore for various reasons. You can also achieve the same thing by using tilt/shift lenses on DSLR or mirrorless cameras.
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If you keep the camera level, this is just as "correct" as doing it with a bellows camera; all you're doing is changing what part of the image circle you use for your photograph. You throw away some pixels, but pixels are increasingly cheap.