One of those many innovations was their Multiplane Camera, and it is really cool from both a photography and animation perspective. This camera was essentially how Disney as able to create semi-realistic three-dimensional environments back in the hand-drawn animation days.
The camera worked by separating the various elements of a scene and moving them independently of each other, snapping a frame for each movement. The resulting footage took Disney’s animations to another level in a time when computer graphics were not even an idea. This informative video from the Disney archives is really great at explaining the technique, and the camera itself.
I found this view into analog animation techniques rather interesting. Of course all of this is now done with computers rendering 3D environments. But one could, if they wished, fairly easily use this same method today with a digital camera. It would take forever to capture a feature length animation, but the results would true to that old Disney style.
I think it goes to show interesting ways that photography helped shape the course of our entertainment in ways that are not readily apparent. Many have the idea that animation back then was simply people drawing cartoons on paper, but clearly, as can be seen here, the process was much more advanced and photography dependent than they could realize.