I can't recall ever having taken a photograph without a spirited level either attached or built-in to the camera.
I am the Horizon Gestapo and cannot abide slight inclines to the horizon. Of course, there is a point of tilt beyond which a slanting horizon becomes an intrinsic part of the statement being made.
In the movies, tilting the camera off level was referred to as Dutch tilt. I wonder if the same applies to ARAT?
W