as far as tilted horizons are concerned, YEARS (decades) ago (1985) i was working for the local newspaper. they were owned by Gannett (the people who own and publish USAToday) but i only ever covered local stuff.
a teacher and her husband in town, always hosted a jazz show on their property in July or August, on the beach of Lake Huron (one of the great lakes) and these musicians came from across the country and Canada. im sure there were some from Europe too at times.
i got on the stage near the back of the 'tent' and took one of my 'trademark' lol, Crowd shots from the band's point of view. i dont know if it was because i was holding my (film) camera on an angle, or if i wasnt paying attention when i was printing it for the paper but i had the horizon line, of Lake Huron running about 12-14o off level.
they ran the picture as printed (i had one assignement where they sent another photographer out to re-shoot it because they didnt like what i had submitted, OOPS!) and it was a full width spread. the photo editor (my BOSS) had taken the page of paper it was on, wrote in big red letters "WHY ARE YOU TRYING TO DRAIN THE LAKE?" across it and taped it to the outside of the photo offices.... i was so embarassed.
NOW i almost always hit "Auto" on the straightening button in Crop tool on LrC, and to this day, i STILL shoot stuff with a little tilt. i dont know why....
however, if you DO put a big tilt to a shot, its known in the art world as a Dutch Angle (or Dutch tilt, canted angle, vortex plane, or oblique angle)....