But then, how does the Artificial Horizon on the instrument panel work? (before this video i thought it would be something with water or a weight, but that wouldn't work either),(reply>), +freakaefari It is a gyroscope, a spinning disk that stays flat because that is what spinning disks do. They also are biased in some way so they change angle slowly, because, if they weren't, they'd maintain the horizon from where you took off, which wouldn't be that useful when you'd flown 1/4 of the way around the earth.